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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Goodwill | $ 6,215 | $ 5,984 | $ 5,740
Increase in goodwill during the period | 231 |  |
Amortization expenses for other intangible assets | 100 | $ 76 | $ 78
Indefinite-lived intangible assets | 18 |  |
Expected amortization expenses related to other intangible assets in 2017 | 97 |  |
Expected amortization expenses related to other intangible assets in 2018 | 87 |  |
Expected amortization expenses related to other intangible assets in 2019 | 77 |  |
Expected amortization expenses related to other intangible assets in 2020 | 69 |  |
Expected amortization expenses related to other intangible assets in 2021 | $ 58 |  |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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