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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 01, 2017
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits |  |  |  |  | $ 1
Impact of unrecognized tax benefits if recognized |  |  |  |  | $ 1
Period of expiration of the statute of limitations for certain jurisdictions |  |  | Within the next twelve months |  |
Jurisdictions statutes of limitations expiration period |  |  | 12 months |  |
ASU 2016-09 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Excess tax benefit from share based compensation | $ 1 | $ 24 | $ 8 | $ 35 |
Minimum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years |  |  | 3 years |  |
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Accrued interest and penalties | $ 1 |  | $ 1 |  |
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years |  |  | 4 years |  |

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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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