Financial Instruments, Derivatives and Fair Value Measures - Gain or Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign currency forward exchange contracts | Not designated as hedging instrument | Net foreign exchange loss (gain)
Gain (loss) on derivatives
Income (expense) and Gain (loss) Reclassified into Income	$ 75	$ (100)	$ (64)
Foreign currency forward exchange contracts | Cash flow hedges | Designated as hedging instrument
Gain (loss) on derivatives
Gain (loss) Recognized in Other Comprehensive Income (loss)	9	73	(226)
Foreign currency forward exchange contracts | Cash flow hedges | Designated as hedging instrument | Cost of products sold
Gain (loss) on derivatives
Income (expense) and Gain (loss) Reclassified into Income	79	(114)	(48)
Debt | Net investment hedges | Designated as hedging instrument
Gain (loss) on derivatives
Gain (loss) Recognized in Other Comprehensive Income (loss)	4		(25)
Interest rate swaps | Fair value hedges | Designated as hedging instrument | Interest expense
Gain (loss) on derivatives
Income (expense) and Gain (loss) Reclassified into Income	$ 148	$ (97)	$ (24)