Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Amounts Recognized on Balance Sheet (Details)

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Employee Benefit Plans - Amounts Recognized on Balance Sheet (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Other assets $ 17,464 $ 15,155
Total Defined Benefit Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 1,110 1,414
Accrued expenses and other liabilities (275) (229)
Net amount recognized at December 31 835 1,185
U.S. Defined Benefit Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 908 1,096
Accrued expenses and other liabilities (7) (7)
Net amount recognized at December 31 901 1,089
Non-U.S. Defined Benefit Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 202 318
Accrued expenses and other liabilities (268) (222)
Net amount recognized at December 31 (66) [1] 96 [1]
Postretirement Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Accrued expenses and other liabilities (290) (312)
Net amount recognized at December 31 $ (290) [2] $ (312) [2]
[1] Primarily represents the U.K. pension plan, which accounts for 83% of the fair value of plan assets and 70% of the benefit obligation at December 31, 2012.
[2] Approximately 92% of the postretirement benefit obligation at December 31, 2012 relates to the U.S. postretirement plan.