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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Current portion of income tax provision:          
Federal $ (1) $ (1) $ (11) $ (1)  
State (8) (9) (29) (26)  
Foreign 0 0 0 (3)  
Total current portion (9) (10) (40) (30)  
Deferred portion of income tax provision:          
Federal (4) (6) 0 (19)  
State (9) (2) (5) (5)  
Total deferred portion (13) (8) (5) (24)  
Total provision for income taxes (22) $ (18) (45) $ (54)  
Deferred tax liabilities:          
Attributable to investment in OTA 432   432   $ 406
Attributable to property, plant and equipment 137   137   133
Attributable to investments in other entities 5   5   5
Other 59   59   60
Total deferred tax liabilities 633   633   604
Deferred tax assets:          
Net operating loss carryovers [1] 46   46   22
Temporary differences related to Texas Margin Tax 4   4   4
Total deferred tax assets 50   50   26
Valuation allowance 22   22   22
Total deferred tax assets, net of valuation allowance 28   28   4
Total net deferred tax liabilities $ 605   $ 605   $ 600
[1] The loss amount presented as of September 30, 2023 has an indefinite carryover period.  All losses are subject to limitations on their utilization.