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Performance Share Unit, Deferred Stock Unit, and Historically Granted Restricted Stock Activity (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Actual tax benefit realized for the tax deductions from the shares vested |  | $ 7
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Actual tax benefit realized for the tax deductions from the shares vested | $ 1 |

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