Financial Instruments - Location and Pretax Gain or Loss Amounts for Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Ineffectiveness on the hedged item	$ 1	$ 7	$ 3
Derivatives not designated in a hedging relationship | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (gain) loss recognized in Other (income) expense, net on derivatives	132	(461)	(516)
Amount of (gain) loss recognized in Sales	0	(1)	15
Derivatives designated in a fair value hedging relationship | Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (gain) loss recognized in Other (income) expense, net on derivatives	28	(14)	(17)
Amount of loss (gain) recognized in Other (income) expense, net on hedged item	(29)	7	14
Derivatives designated in foreign currency cash flow hedging relationships | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to Sales	(311)	(724)	(143)
Amount of gain recognized in OCI on derivatives	(210)	(526)	(775)
Derivatives designated in foreign currency net investment hedging relationships | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in Other (income) expense, net on derivatives	(1)	(4)	(6)
Amount of gain recognized in OCI on derivatives	$ 2	$ (10)	$ (192)