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Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Balance Sheet) (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]    
Derivative assets with affiliates $ 56 $ 28
Other Current Assets [Member]    
Related Party Transaction [Line Items]    
Derivative assets with affiliates 14 4
Other Deferred Debits and Other Assets [Member]    
Related Party Transaction [Line Items]    
Derivative assets with affiliates $ 42 $ 24