Variable Interest Entities (Consolidated Information of Variable Interest Entity) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 157	$ 164
Prepayments and other current assets	91	113
Plant, property, and equipment, net	24,694	22,713
Construction work in progress	1,626	1,182
Total Assets	32,513	31,353
Current portion of long term debt	1,037	1,090
Non-current portion of finance leases	63	68
Asset retirement obligations	768	746
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	34	43
Accounts receivable	4	7
Prepayments and other current assets	3	7
Plant, property, and equipment, net	835	850
Construction work in progress	242	156
Total Assets	1,118	1,063
Current portion of long term debt	0	100
Accounts payable	19	33
Non-current portion of finance leases	23	23
Asset retirement obligations	32	24
Total liabilities	$ 74	$ 180