Exit Activities (Schedule of Retention Benefit Liability Roll Forward) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Other current liabilities	$ 213		$ 213		$ 149
Retention Benefits
Restructuring Reserve [Roll Forward]
Retention benefit liability at beginning of period			16	$ 21
Costs deferred as a regulatory asset	3	$ 4	6	14
Costs paid or settled			0	(13)
Retention benefit liability at the end of the period	22	22	22	22
Other current liabilities	$ 9	$ 11	$ 9	$ 11