Reclassifications from Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 4,324	$ 2,547
Ending balance	6,254	(119)
Net actuarial loss incurred in period	2	0
Net tax loss attributable to pension termination	14	0
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	6	(25)
Other comprehensive income before reclassifications	1
Amounts reclassified from other comprehensive income	(16)
Net current-period other comprehensive loss	(15)
Ending balance	(9)	$ (25)
Pension and Other Postretirement
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	20
Other comprehensive income before reclassifications	1
Amounts reclassified from other comprehensive income	(16)
Net current-period other comprehensive loss	(15)
Ending balance	5
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 loss	0
Ending balance	$ (14)