Share-Based Associate Compensation Plans (Stock Option Information) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Shares
Outstanding at beginning of year | shares	4,958
Granted | shares	386
Exercised | shares	(996)
Forfeited or expired | shares	(476)
Outstanding at end of year | shares	3,872
Options exercisable at end of period | shares	3,128
Weighted-average exercise price
Outstanding at beginning of year | $ / shares	$ 39.10
Granted | $ / shares	52.24
Exercised | $ / shares	40.30
Forfeited or expired | $ / shares	41.64
Outstanding at end of year | $ / shares	39.78
Options exercisable at end of period | $ / shares	$ 37.54
Aggregate intrinsic value
Outstanding at end of year | $	$ 77
Options exercisable at end of period | $	$ 69