Derivative Instruments (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (42)
Interest Rate Swap [Member]
Derivative, Maturity Date	Jul. 27, 2021
Derivative, Notional Amount	$ 1,550	$ 1,550
Forward-starting interest rate swap [Member]
Derivative, Maturity Date	Mar. 01, 2025
Derivative, Notional Amount	$ 1,500	1,500
Foreign Exchange Contract [Member] | Intercompany receivables and payables
Derivative, Notional Amount	$ 34	$ 39