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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Liability for unrecognized tax benefits | $ 429 |  | $ 429 |  | $ 418
Unrecognized tax benefits, accrued interest | 40 |  | 40 |  | 45
Unrecognized tax benefits that would impact effective tax rate | 136 |  | 136 |  | $ 137
Provision for tax benefits related to settlement of employee awards | 4 | $ 11 | 80 | $ 129 |
Reductions in interest (net of tax) | $ 4 | 17 | $ 16 | 17 |
Provision for income taxes |  | $ 51 |  | $ 51 |

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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