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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Current portion of income tax benefit (provision):      
Federal $ 0 $ 1  
State (10) (5)  
Foreign 0 (1)  
Total current portion (10) (5)  
Deferred portion of income tax benefit (provision):      
Federal (7) (6)  
State (2) 1  
Total deferred portion (9) (5)  
Total provision for income taxes (19) $ (10)  
Deferred tax liabilities:      
Attributable to investment in OTA 391   $ 384
Attributable to property, plant and equipment 120   118
Attributable to investments in other entities 5   5
Other 36   14
Total deferred tax liabilities 552   521
Deferred tax assets:      
Net operating loss carryovers [1] 4   14
Temporary differences related to Texas Margin Tax 3   3
Total deferred tax assets 7   17
Valuation allowance 4   14
Total deferred tax assets, net of valuation allowance 3   3
Total net deferred tax liabilities $ 549   $ 518
[1] The loss amount presented as of March 31, 2022 has an indefinite carryover period.  All losses are subject to limitations on their utilization.