Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 465	$ 103
Prepayments and other current assets	115	103
Plant, property, and equipment, net	27,903	27,461
Other non-current assets	310	384
Total Assets	36,295	35,920	$ 33,901
Accrued taxes	474	654
Non-current portion of finance leases	111	112
Asset retirement obligations	725	728
Other non‑current liabilities	370	407
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	20	18
Accounts receivable	5	4
Prepayments and other current assets	5	3
Plant, property, and equipment, net	1,046	1,024
Other non-current assets	6	3
Total Assets	1,082	1,052
Accounts payable	6	8
Accrued taxes	1	0
Non-current portion of finance leases	23	23
Asset retirement obligations	34	33
Other non‑current liabilities	3	0
Total liabilities	$ 67	$ 64