v3.19.3.a.u2
Fair Value of Financial Instruments - Schedule of Interest Rate Swaps Outstanding (Detail) - Interest Rate Swaps [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Aggregate Notional Amount $ 821 $ 800  
Gross Asset at Fair Value 1 12  
Gross Liability at Fair Value 27 1  
Gross gains 11 22 $ 7
Gross losses $ 51 $ 12 $ 13