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Financial Instruments - Schedule of Interest Rate Swap Agreements Designated as Cash Flow Hedges (Detail) - Pay-Fixed Interest Rate Swaps [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Maturity Date, 2021 [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Notional Amount | $ 2,000
Fair Value | $ (34)
Maturity Date | 2021-12
Maturity Date, 2022 [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Notional Amount | $ 500
Fair Value | $ (21)
Maturity Date | 2022-12

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