Restructuring Charges - Components of Restructuring Charges Less Releases Recorded in Liabilities (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | $ 68 | $ 264 | $ 28 |
| Personnel Lay-Off Costs [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | 52 | 239 | 43 |
| Other Exit Costs [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | 19 | 27 | 1 |
| Release of Provisions/Accruals [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | $ (3) | $ (2) | $ (16) |