Supplemental Equity and Comprehensive Income Information - Reclass AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of tax	$ (50)	$ (74)	$ (85)	$ (135)
Gains (losses) associated with defined benefit pension and postretirement plans amortization
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Transition asset	1	1	1	1
Prior service benefit	24	17	47	35
Net actuarial loss	(126)	(159)	(252)	(318)
Curtailments/Settlements				17
Total before tax	(101)	(141)	(204)	(265)
Tax effect	34	45	68	91
Net of tax	(67)	(96)	(136)	(174)
Cash flow hedging instruments gains (losses)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total before tax	28	34	80	61
Tax effect	(11)	(12)	(29)	(22)
Net of tax	17	22	51	39
Cash flow hedging instruments gains (losses) | Foreign currency forward/option contracts
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ 28	35	81	65
Cash flow hedging instruments gains (losses) | Commodity price swap contracts
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of sales				(2)
Cash flow hedging instruments gains (losses) | Interest rate swap contracts
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ (1)	$ (1)	$ (2)