Stockholders' Equity - Summary of Pre-tax Intrinsic Values and Total Fair Value of Vested Restricted Stock (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Jan. 01, 2017 |
Jan. 03, 2016 |
|
| Restricted stock units (RSU) [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Pre-tax intrinsic value of outstanding restricted stock | $ 456 | $ 294 | $ 423 |
| Fair value of restricted stock vested | 113 | 98 | 86 |
| Performance stock units (PSU) [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Pre-tax intrinsic value of outstanding restricted stock | 118 | 59 | 112 |
| Fair value of restricted stock vested | $ 17 | $ 30 | $ 45 |