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Derivative and Hedging Instruments Foreign Exchange Risk Management (Details) € in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2015 EUR (€)
Foreign Exchange Risk Management
Gain (loss) for contracts to purchase and sell foreign currency	$ (136)
Terms of the foreign currency forward contracts		18 months
Payments for settlement of derivative instrument		$ 175	$ 0	$ 0
Cash flow hedges		(189)	14	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		(144)	11	0
Foreign exchange contracts \| General and Administrative
Foreign Exchange Risk Management
Gain (loss) for contracts to purchase and sell foreign currency		40	(39)	$ 53
Net Investment Hedging
Foreign Exchange Risk Management
Euro-denominated debt designated as hedge of net investment in European foreign operations denominated in euros \| €					€ 1,650
Cash Flow Hedging \| Interest Rate Risk
Foreign Exchange Risk Management
Notional amount			$ 1,000
Payments for settlement of derivative instrument		175
Cash flow hedges	14
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		133
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	$ 11
Other Comprehensive Income (Loss), Cash Flow Hedge, Reclassification for Discontinuance, before Tax		4
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		$ 6