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Supplemental Equity and Comprehensive Income Information - Reclass AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Sales or impairments of securities $ 1,571 $ 1,493
Net of tax (71) (35)
Gains (losses) associated with defined benefit pension and postretirement plans amortization    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Prior service benefit 22 23
Net actuarial loss (141) (126)
Total before tax (119) (103)
Tax effect 36 34
Net of tax (83) (69)
Cash flow hedging instruments gains (losses)    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 18 52
Tax effect (6) (18)
Net of tax 12 34
Cash flow hedging instruments gains (losses) | Foreign currency forward/option contracts    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Cost of sales $ 18 53
Cash flow hedging instruments gains (losses) | Interest rate swap contracts    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Interest expense   $ (1)