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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 | 12 Months Ended
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Dec. 31, 2019 USD ($)
Maturity Date, 2021 [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Notional Amount | $ 2,000
Fair Value | $ 3
Maturity Date | 2021-12
Maturity Date, 2022 [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Notional Amount | $ 500
Fair Value | $ (7)
Maturity Date | 2022-12

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