Comprehensive Income (Loss) (Summary of the Activity in AOCI, Net of the Related Tax Effects) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period		$ (18)	$ (33)
Other comprehensive income (loss) before reclassifications:
Pre-tax amount		15	7
Tax provision (benefit)		3	2
After-tax amount		11	5
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	2	2
Net current period other comprehensive income (loss)		13	7
Balance at the end of period		(5)	(26)
Unrealized Loss On Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period		(18)	(33)
Other comprehensive income (loss) before reclassifications:
Pre-tax amount		15	7
Tax provision (benefit)		3	2
After-tax amount		11	5
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	2	2
Net current period other comprehensive income (loss)		13	7
Balance at the end of period		$ (5)	$ (26)

[1] Amounts are net of tax. See reclassifications out of AOCI below for further details.