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Variable Interest Entities (Consolidated Information of Variable Interest Entity) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Cash and cash equivalents $ 389 $ 164
Prepayments and other current assets 125 113
Plant, property, and equipment, net 24,264 22,713
Total assets 32,265 31,353
Asset retirement obligations 759 746
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Cash and cash equivalents 22 28
Accounts receivable 4 7
Prepayments and other current assets 4 3
Plant, property, and equipment, net 810 825
Total assets 840 863
Accounts payable 7 15
Asset retirement obligations 24 24
Total liabilities $ 31 $ 39