Restructuring Charges - Restructuring Charges Less Releases Recorded in Liabilities Per Line Item in Statement of Operations (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | $ 6 | $ 1 | $ 68 |
| Cost of Revenue [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | 0 | 3 | 18 |
| Selling, General and Administrative [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | 7 | 10 | 9 |
| Research and Development [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | 0 | (12) | 41 |
| Other Income (Expense) [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | $ (1) | $ 0 | $ 0 |