Income Taxes And Tax-Related Items Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Balance at January 1	$ 16	$ 18	$ 19
(Decrease) increase as a result of tax positions taken during a prior period	0	(2)	(1)
Increase as a result of tax positions taken during a current period	1	3	3
Decreases related to settlements with tax authorities	(10)	(3)	(3)
Decrease related to other tax position changes	0	0	(2)
Balance at December 31	$ 7	$ 16	$ 18