Exit Activities and Discontinued Operations (Schedule of Retention Benefit Liability Roll Forward) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Other current liabilities	$ 148		$ 149
Retention Benefits
Restructuring Reserve [Roll Forward]
Retention benefit liability at beginning of period	16	$ 21
Costs deferred as a regulatory asset	3	5
Retention benefit liability at the end of the period	19	26
Other current liabilities	$ 8	$ 16