Variable Interest Entities (Consolidated Information of Variable Interest Entity) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 164	$ 452
Restricted cash and cash equivalents	18	24
Accounts receivable	1,564	931
Prepayments and other current assets	113	139
Plant, property, and equipment, net	22,713	22,352
Total assets	31,353	28,753	$ 29,666
Accounts payable	928	875
Other current liabilities	166	156
Asset retirement obligations	746	628
Other non‑current liabilities	397	375
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	28	21
Restricted cash and cash equivalents	0	1
Accounts receivable	7	3
Prepayments and other current assets	3	2
Plant, property, and equipment, net	825	856
Total assets	863	883
Accounts payable	15	17
Other current liabilities	0	2
Asset retirement obligations	24	23
Other non‑current liabilities	0	4
Total liabilities	$ 39	$ 46