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Income Taxes, Benefit from (provision for) income taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Components of Benefit From (Provision For) Income Taxes:    
Texas Margin Tax [1] $ (12) $ (3)
Other 0 (1)
Provision for income taxes (19) (10)
OTA Holdings, Inc. [Member]    
Components of Benefit From (Provision For) Income Taxes:    
Provision for income taxes $ (7) $ (6)
[1] Although the Texas Margin Tax is not considered a state income tax, it has the characteristics of an income tax since it is determined by applying a tax rate to a base that considers our Texas-sourced revenues and expenses.