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Financial Instruments - Effect of Interest Rate Swaps on Results of Operations (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |
Amount of Gain Recognized in OCI on Derivatives, Net of Tax | $ (1)
Interest Rate Swaps [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Amount of Gain Recognized in OCI on Derivatives, Net of Tax | 1
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income into Operations [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Interest rate swaps | $ 9

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