Exit Activities and Discontinued Operations - Schedule of Retention Benefit Liability Roll Forward (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Other current liabilities	$ 166	$ 156
Retention Benefits
Restructuring Reserve [Roll Forward]
Retention benefit liability at beginning of period	14	11
Costs deferred as a regulatory asset	24	7
Costs paid or settled	(17)	(5)
Retention benefit liability at the end of the period	21	14
Other current liabilities	13	5
Retention Benefits | D.E. Karn Generating Complex
Restructuring Reserve [Roll Forward]
Costs incurred and capitalized	$ 0	$ 1