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Financial Instruments - Effect of Interest Rate Swaps on Results of Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Loss Recognized in OCI on Derivatives, Net of Tax | $ (37) | $ 18 | $ 7
Interest Rate Swaps [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Loss Recognized in OCI on Derivatives, Net of Tax | 37 |  |
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest rate swaps | $ 17 |  |

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