Supplemental Financial Information - Depreciation, Amortization and Impairment (Detail) - USD ($) $ in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Property, Plant and Equipment [Line Items] | |||||
| Depreciation of property, plant and equipment | $ 609 | $ 262 | $ 219 | ||
| Amortization of intangible assets | 1,507 | 255 | |||
| Depreciation, amortization and impairment | 2,205 | 517 | 405 | ||
| Computer Software, Intangible Asset [Member] | |||||
| Property, Plant and Equipment [Line Items] | |||||
| Amortization of intangible assets | 24 | 26 | 31 | ||
| Other Intangible Assets [Member] | |||||
| Property, Plant and Equipment [Line Items] | |||||
| Amortization of intangible assets | [1] | $ 1,572 | $ 229 | $ 155 | |
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