Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 362	$ 103
Prepayments and other current assets	98	103
Plant, property, and equipment, net	29,690	27,461
Other non-current assets	202	384
Total Assets	38,008	35,920	$ 34,817
Accrued taxes	200	654
Non-current portion of finance leases	137	112
Asset retirement obligations	731	728
Other non‑current liabilities	396	407
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	19	18
Accounts receivable	3	4
Prepayments and other current assets	3	3
Plant, property, and equipment, net	1,028	1,024
Other non-current assets	6	3
Total Assets	1,059	1,052
Accounts payable	9	8
Accrued taxes	1	0
Non-current portion of finance leases	24	23
Asset retirement obligations	35	33
Other non‑current liabilities	3	0
Total liabilities	$ 72	$ 64