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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Current portion of income tax provision:          
Federal $ (1) $ (1) $ (1) $ (11)  
State (9) (8) (31) (29)  
Total current portion (10) (9) (32) (40)  
Deferred portion of income tax provision:          
Federal (4) (4) (12) 0  
State (4) (9) (10) (5)  
Foreign (1) 0 (1) 0  
Total deferred portion (9) (13) (23) (5)  
Total provision for income taxes (19) $ (22) (55) $ (45)  
Deferred tax liabilities:          
Attributable to investment in OTA [1] 456   456   $ 436
Attributable to property, plant and equipment 148   148   138
Attributable to investments in other entities 5   5   4
Other 83   83   83
Total deferred tax liabilities 692   692   661
Deferred tax assets:          
Net operating loss carryovers [2] 55   55   46
Temporary differences related to Texas Margin Tax 3   3   4
Total deferred tax assets 58   58   50
Total net deferred tax liabilities $ 634   $ 634   $ 611
[1] Represents the deferred tax liability balance held by our wholly owned subsidiary, OTA Holdings, Inc. ("OTA"), which we acquired in March 2020.
[2] The loss amount presented as of September 30, 2024 has an indefinite carryover period.  All losses are subject to limitations on their utilization.