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Basis of Presentation - Revenue (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) segment | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Number of areas | segment | 17 |  |
Retained earnings | $ 8,867 |  | $ 8,588
Contract acquisition costs | 136 |  |
Deferred income taxes | $ 1,258 |  | $ 1,248
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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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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