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Income Taxes, Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reconciliation of the provision for income taxes [Abstract]        
Pre-Tax Net Book Income ("NBI") $ 1,451 $ 1,372 $ 4,392 $ 4,100
Texas Margin Tax [1] (13) (17) (40) (33)
State income tax provision, net of federal benefit (1) 0 (1) (1)
Federal income tax provision computed by applying the federal statutory rate to NBI of corporate entities (4) (5) (12) (11)
Other (1) 0 (2) 0
Total provision for income taxes $ (19) $ (22) $ (55) $ (45)
Effective income tax rate (1.30%) (1.60%) (1.30%) (1.10%)
[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.