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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 6,254	$ (119)	$ 4,324	$ 2,547
Other comprehensive income before reclassifications			1
Amounts reclassified from other comprehensive income			(16)
Net current-period other comprehensive loss			(15)
Ending balance	6,489	1,043	6,489	1,043
Net actuarial loss incurred in period	0	0	2	0
Net tax loss attributable to pension termination	0	0	14	0
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(9)	(25)	6	(25)
Ending balance	(9)	$ (25)	(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		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)		$ (14)