v3.20.2
Fair Value of Financial Instruments - Schedule of Interest Rate Swaps Outstanding (Detail) - Interest Rate Swaps [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Aggregate Notional Amount $ 558   $ 558   $ 821
Gross Asset at Fair Value         1
Gross Liability at Fair Value 64   64   $ 27
Gross losses   $ 13 42 $ 51  
Gross gains $ 1   $ 1