Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Other Changes Recognized in OCI (Details)

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Employee Benefit Plans - Other Changes Recognized in OCI (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) $ (3,031)    
Amortization of actuarial gain (loss) (235)    
Current year prior service cost (2)    
Amortization of prior service cost (4)    
Net change (3,268) 23 734
Qualified Pension Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) (3,128)    
Amortization of actuarial gain (loss) (242)    
Current year prior service cost 0    
Amortization of prior service cost 0    
Net change (3,370)    
Nonqualified and Other Pension Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) 164    
Amortization of actuarial gain (loss) (27)    
Current year prior service cost 0    
Amortization of prior service cost 0    
Net change 137    
Postretirement Health and Life Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) (180)    
Amortization of actuarial gain (loss) 36    
Current year prior service cost 0    
Amortization of prior service cost (4)    
Net change (148)    
Non-U.S. Pension Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) 113    
Amortization of actuarial gain (loss) (2)    
Current year prior service cost (2)    
Amortization of prior service cost 0    
Net change $ 113