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New Accounting Standards and Reclassifications - Revenue (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings | $ 9,797 |  | $ 8,588
Contract acquisition costs | 145 |  |
Deferred income taxes | $ 1,291 |  | $ 1,248
Revenue, Practical Expedient, Remaining Performance Obligation [true/false] | true |  |
Accounting Standards Update 2014-09 [Member] | Impact of adoption [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings |  | $ 80 |
Contract acquisition costs |  | 108 |
Deferred income taxes |  | $ 28 |

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