Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 227	$ 164
Prepayments and other current assets	80	113
Plant, property, and equipment, net	25,072	22,713
Construction work in progress	944	1,182
Other non-current assets	357	310
Total Assets	33,517	31,353	$ 28,753
Current portion of long-term debt	975	1,090
Non-current portion of finance leases	62	68
Asset retirement obligations	771	746
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	28	43
Accounts receivable	3	7
Prepayments and other current assets	4	7
Plant, property, and equipment, net	1,064	850
Construction work in progress	0	156
Other non-current assets	3	0
Total Assets	1,102	1,063
Current portion of long-term debt	0	100
Accounts payable	12	33
Non-current portion of finance leases	23	23
Asset retirement obligations	32	24
Total liabilities	$ 67	$ 180