Reclassifications from Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 497	$ 3,246	$ 2,362
Other comprehensive income before reclassifications	11
Amounts reclassified from other comprehensive income	2
Net current-period other comprehensive income	13	(5)	3
Ending balance	2,547	497	3,246
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(38)	(33)	(36)
Net current-period other comprehensive income	13	(5)	3
Ending balance	(25)	(38)	$ (33)
Pension and Other Postretirement
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(24)
Other comprehensive income before reclassifications	11
Amounts reclassified from other comprehensive income	2
Net current-period other comprehensive income	13
Ending balance	(11)	(24)
Foreign Currency
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(14)
Other comprehensive income before reclassifications	0
Amounts reclassified from other comprehensive income	0
Net current-period other comprehensive income	0
Ending balance	$ (14)	$ (14)