Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions |
6 Months Ended | |
|---|---|---|
Jan. 31, 2016 |
Feb. 01, 2015 |
|
| Statement [Line Items] | ||
| Shares repurchased, value | $ 86 | $ 133 |
| June 2011 Program [Member] | ||
| Statement [Line Items] | ||
| Authorized amount for shares repurchase | 1,000 | |
| Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 500 | |
| Treasury Stock [Member] | ||
| Statement [Line Items] | ||
| Treasury stock purchased, shares | 2 | 3 |
| Shares repurchased, value | $ 86 | $ 133 |
| Treasury Stock [Member] | June 2011 Program [Member] | ||
| Statement [Line Items] | ||
| Shares repurchased, value | $ 50 | |