Financial Instruments - Economic Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Embedded derivatives, loss	$ 14	$ 7	$ 3
Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	131	(24)	(4)
Derivatives not designated as hedging instruments | Currency exchange contracts | Cost of goods sold | Sales of goods
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) from derivatives	59	(13)	(35)
Derivatives not designated as hedging instruments | Currency exchange contracts | Cost of goods sold | Sales of services
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) from derivatives	62	(15)	32
Derivatives not designated as hedging instruments | Commodity derivatives | Cost of goods sold | Sales of goods
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) from derivatives	2	2	(1)
Derivatives not designated as hedging instruments | Other derivatives | Other non-operating income (loss), net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) from derivatives	$ 8	$ 2	$ 0