Share-Based Associate Compensation Plans (Stock Option Information) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Shares
Outstanding at beginning of year (in shares) | shares	3,066
Granted (in shares) | shares	757
Exercised (in shares) | shares	(384)
Forfeited or expired (in shares) | shares	(165)
Outstanding at end of year (in shares) | shares	3,274
Options exercisable at end of period (in shares) | shares	2,004
Weighted-average exercise price
Outstanding at beginning of year (in dollars per share) | $ / shares	$ 49.14
Granted (in dollars per share) | $ / shares	71.19
Exercised (in dollars per share) | $ / shares	37.00
Forfeited or expired (in dollars per share) | $ / shares	40.90
Outstanding at end of year (in dollars per share) | $ / shares	56.08
Options exercisable at end of period (in dollars per share) | $ / shares	$ 47.09
Aggregate intrinsic value
Outstanding at end of year | $	$ 68
Options exercisable at end of period | $	$ 60
Weighted-average remaining contractual life
Outstanding option shares at December 31, 2018	6 years 28 days
Options exercisable at end of period	4 years 5 months 20 days