Stock-Based Associate Compensation Plans (Stock Option Information) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Shares
Outstanding at beginning of year	7,937
Granted	394
Exercised	(1,440)
Forfeited or expired	(559)
Outstanding at end of year	6,332
Options exercisable at end of period	5,360
Weighted-average exercise price
Outstanding at beginning of year	$ 37.34
Granted	$ 44.70
Exercised	$ 35.98
Forfeited or expired	$ 34.07
Outstanding at end of year	$ 38.39
Options exercisable at end of period	$ 38.33
Aggregate intrinsic value
Outstanding at end of year	$ 88
Options exercisable at end of period	$ 75