Derivatives and Hedging - Net Investments in Foreign Operations Risk Management Narrative (Details) $ in Millions			6 Months Ended
	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)	Jun. 30, 2020 EUR (€)	Jun. 30, 2020 USD ($)
Derivatives, Fair Value
Non-derivative hedging instrument, unrealized gain		$ 29
Net Investment Hedging
Derivatives, Fair Value
European denominated commercial paper	€ 101,000,000	$ 112	€ 0
Non-derivative hedging instrument, unrealized gain				$ 29