Transition Activities - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Other current liabilities	$ 187		$ 187		$ 187	$ 166
Retention Benefits
Restructuring Reserve [Roll Forward]
Retention benefit liability at beginning of period			21	$ 14	17
Costs deferred as a regulatory asset	5	$ 2	10	3
Retention benefit liability at the end of the period	31	17	31	17	31
Other current liabilities	$ 18	$ 6	$ 18	$ 6	$ 18