Share-Based Associate Compensation Plans (Stock Option Information) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Shares
Outstanding at beginning of year	6,332
Granted	401
Exercised	(1,086)
Forfeited or expired	(689)
Outstanding at end of year	4,958
Options exercisable at end of period	4,165
Weighted-average exercise price
Outstanding at beginning of year	$ 38.39
Granted	$ 46.81
Exercised	$ 37.59
Forfeited or expired	$ 39.49
Outstanding at end of year	$ 39.10
Options exercisable at end of period	$ 38.17
Aggregate intrinsic value
Outstanding at end of year	$ 66
Options exercisable at end of period	$ 59