Schedule II Valuation and Qualifying Accounts (Details) - Deferred Tax Asset Valuation Allowance [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Valuation And Qualifying Accounts
Beginning Balance	[1]	$ 297	$ 325	$ 319
Additions Charged (Credited) To Cost and Expenses		(97)	(28)	6
Additions Other		0	0	0
Deductions		0	0	0
Ending Balance	[1]	$ 200	$ 297	$ 325

[1] Deducted from related assets.