Employee Benefit Plans - Pretax Amounts Included in Accumulated OCI (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 5,630	$ 6,111
Prior service cost (credits)	39	36
Amounts recognized in accumulated OCI	5,669	6,147
U.S. \| Postretirement Health and Life Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(93)	(128)
Prior service cost (credits)	0	0
Amounts recognized in accumulated OCI	(93)	(128)
Non-U.S. \| Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	447	468
Prior service cost (credits)	39	36
Amounts recognized in accumulated OCI	486	504
Qualified \| U.S. \| Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	4,398	4,901
Prior service cost (credits)	0	0
Amounts recognized in accumulated OCI	4,398	4,901
Nonqualified \| U.S. \| Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	878	870
Prior service cost (credits)	0	0
Amounts recognized in accumulated OCI	$ 878	$ 870