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Summary of Significant Accounting Policies - Identified Intangible Assets by Major Classification (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Intangible Assets Net Excluding Goodwill [Line Items] |  |  |
Gross | $ 6,334 | $ 6,320 |
Accumulated Amortization | (2,804) | (2,471) |
Net Book Value | 3,530 | 3,849 | $ 4,444
Indefinite-lived Trade Names [Member] |  |  |
Intangible Assets Net Excluding Goodwill [Line Items] |  |  |
Gross | 384 | 384 |
Net Book Value | 384 | 384 |
Customer Relationships [Member] |  |  |
Intangible Assets Net Excluding Goodwill [Line Items] |  |  |
Gross | 4,024 | 4,016 |
Accumulated Amortization | (1,874) | (1,630) |
Net Book Value | 2,150 | 2,386 |
Trademarks [Member] |  |  |
Intangible Assets Net Excluding Goodwill [Line Items] |  |  |
Gross | 878 | 880 |
Accumulated Amortization | (290) | (265) |
Net Book Value | 588 | 615 |
Other [Member] |  |  |
Intangible Assets Net Excluding Goodwill [Line Items] |  |  |
Gross | 1,048 | 1,040 |
Accumulated Amortization | (640) | (576) |
Net Book Value | $ 408 | $ 464 |

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