Summary of Accounting Policies (Definite-lived Intangible Asset Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Payments for (proceeds from) hedge, financing activities		$ 0	$ 72	$ 0
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Finite-Lived Intangible Assets [Line Items]
Payments for (proceeds from) hedge, financing activities	$ 72
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life		6 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life		30 years