Annual report [Section 13 and 15(d), not S-K Item 405]

Employee Benefit Plans - Fair Value Measurements (Details)

v3.25.4
Employee Benefit Plans - Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 19,966 $ 19,280  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11,135 10,204  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,352 8,616  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 479 460 $ 437
Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,000 1,800  
Money market and interest-bearing cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,171 1,103  
Money market and interest-bearing cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,171 1,103  
Money market and interest-bearing cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Money market and interest-bearing cash | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. government and agency securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,659 4,632  
U.S. government and agency securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,852 3,875  
U.S. government and agency securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 805 754  
U.S. government and agency securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 3  
Corporate debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,775 2,931  
Corporate debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Corporate debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,775 2,931  
Corporate debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,286 1,363  
Non-U.S. debt securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 501 474  
Non-U.S. debt securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 785 889  
Non-U.S. debt securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,135 1,361  
Asset-backed securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Asset-backed securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,135 1,361  
Asset-backed securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Mutual and exchange-traded funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,074 920  
Mutual and exchange-traded funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,074 920  
Mutual and exchange-traded funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Mutual and exchange-traded funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Collective investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,834 2,670  
Collective investment funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Collective investment funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,834 2,670  
Collective investment funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Common and preferred stocks      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,499 3,795  
Common and preferred stocks | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,499 3,795  
Common and preferred stocks | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Common and preferred stocks | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Real estate investment trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37 36  
Real estate investment trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37 36  
Real estate investment trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Real estate investment trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Participant loans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 6  
Participant loans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Participant loans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Participant loans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 6  
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 490 463  
Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18 11  
Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 471 451  
Insurance Annuity Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 452 432  
Other Various Investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 38 $ 31