Exit Activities and Discontinued Operations - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Other current liabilities	$ 181		$ 181		$ 156
Retention Benefits
Restructuring Reserve [Roll Forward]
Retention benefit liability at beginning of period			14	$ 11
Costs deferred as a regulatory asset	2	$ 2	3	4
Retention benefit liability at the end of the period	17	15	17	15
Other current liabilities	$ 6	$ 5	$ 6	$ 5