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Other Income (Expense), Net (Components of Other Income (Expense), Net) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Operating revenue from contracts with customers $ 1 $ 1
Other income 3 4
Other expense (2) (10)
Allowance for equity funds used during construction 1 0
Other income (expense), net $ 3 $ (5)