Balance Sheet Account Details - Summary of Changes in Reserve for Product Warranties (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2018 |
Oct. 01, 2017 |
Sep. 30, 2018 |
Oct. 01, 2017 |
|
Reserve for product warranties [Roll Forward] | ||||
Balance at beginning of period | $ 15 | $ 14 | $ 17 | $ 13 |
Additions charged to cost of product revenue | 8 | 7 | 20 | 18 |
Repairs and replacements | (6) | (5) | (20) | (15) |
Balance at end of period | $ 17 | $ 16 | $ 17 | $ 16 |