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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 07, 2017
May 08, 2016
May 07, 2017
May 08, 2016
Equity [Abstract]        
Shares repurchased (000's) 266 899 1,486 2,328
Average price per share $ 168.09 $ 151.57 $ 156.51 $ 148.64
Total cost $ 45 $ 136 $ 233 $ 346