Reclassifications from Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning		$ (119)	$ 2,547	$ 586	$ 497	$ 2,547	$ 497
Other comprehensive income	[1]	0		3		0	3
Balance ending		1,043	(119)	(18)	586	1,043	(18)
Accumulated other comprehensive income		1,173	(2,675)	(609)	80	(1,502)	(529)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning		(25)	(25)	(38)	(38)	(25)	(38)
Other comprehensive income before reclassifications						0
Amounts reclassified from other comprehensive income						0
Other comprehensive income		0		3		0
Balance ending		(25)	(25)	$ (35)	$ (38)	(25)	$ (35)
Pension and Other Postretirement
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning			(11)			(11)
Other comprehensive income before reclassifications						0
Amounts reclassified from other comprehensive income						0
Other comprehensive income						0
Balance ending		(11)				(11)
Pension and Other Postretirement | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income						1
Foreign Currency
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning			$ (14)			(14)
Other comprehensive income before reclassifications						0
Amounts reclassified from other comprehensive income						0
Other comprehensive income						0
Balance ending		$ (14)				$ (14)

[1] Settlement adjustment was less than $1 million for the three and six months ended June 30, 2022. Settlement adjustment reflects $1 million in tax benefits for the three and six months ended June 30, 2021.