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Financial Instruments - Effect of Interest Rate Swaps on Results of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest expense | $ 427 | $ 432 | $ 1,257 | $ 1,275
Interest Rate Swaps [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Loss Recognized in OCI on Derivatives, Net of Tax |  |  | 6 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest expense |  |  | $ 17 |

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