v3.8.0.1
Supplemental Equity and Comprehensive Income Information - Reclass AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amount Reclassified from Accumulated Other Comprehensive Income      
Net of tax $ (363) $ (203) $ (250)
Gains (losses) associated with defined benefit pension and postretirement plans amortization      
Amount Reclassified from Accumulated Other Comprehensive Income      
Transition asset   1 1
Prior service benefit 89 92 79
Net actuarial loss (570) (506) (626)
Curtailments/Settlements (2) (8) 9
Total before tax (483) (421) (537)
Tax effect 116 148 176
Net of tax (367) (273) (361)
Cash flow hedging instruments gains (losses)      
Amount Reclassified from Accumulated Other Comprehensive Income      
Total before tax 7 109 174
Tax effect (3) (39) (63)
Net of tax 4 70 111
Cash flow hedging instruments gains (losses) | Foreign currency forward/option contracts      
Amount Reclassified from Accumulated Other Comprehensive Income      
Cost of sales 8 110 178
Cash flow hedging instruments gains (losses) | Commodity price swap contracts      
Amount Reclassified from Accumulated Other Comprehensive Income      
Cost of sales     (2)
Cash flow hedging instruments gains (losses) | Interest rate swap contracts      
Amount Reclassified from Accumulated Other Comprehensive Income      
Interest expense $ (1) $ (1) $ (2)