Equity and Comprehensive Income (Stock Repurchased During Period) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |
3 Months Ended | 8 Months Ended | ||
|---|---|---|---|---|
May 13, 2018 |
May 07, 2017 |
May 13, 2018 |
May 07, 2017 |
|
| Equity [Abstract] | ||||
| Shares repurchased (000's) | 290 | 266 | 1,337 | 1,486 |
| Average price per share | $ 189.66 | $ 168.09 | $ 174.30 | $ 156.51 |
| Total cost | $ 55 | $ 45 | $ 233 | $ 233 |