Revenue from Contracts with Customers and Lease Income - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Contract assets	$ 178	$ 178	$ 117
Contract liabilities	56	56	57
Revenue from contracts with customers recognized	13	32
Unregulated Distributed Generation
Disaggregation of Revenue [Line Items]
Contract assets	59	59	50
Contract liabilities	$ 37	$ 37	$ 39