Share-Based Associate Compensation Plans (Stock Option Information) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Shares
Outstanding at beginning of year (in shares) | shares	3,872
Granted (in shares) | shares	359
Exercised (in shares) | shares	(863)
Forfeited or expired (in shares) | shares	(356)
Outstanding at end of year (in shares) | shares	3,012
Options exercisable at end of period (in shares) | shares	2,319
Weighted-average exercise price
Outstanding at beginning of year (in dollars per share) | $ / shares	$ 39.78
Granted (in dollars per share) | $ / shares	61.47
Exercised (in dollars per share) | $ / shares	38.64
Forfeited or expired (in dollars per share) | $ / shares	44.66
Outstanding at end of year (in dollars per share) | $ / shares	42.12
Options exercisable at end of period (in dollars per share) | $ / shares	$ 38.01
Aggregate intrinsic value
Outstanding at end of year | $	$ 101
Options exercisable at end of period | $	$ 88
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 14 days