Capital Stock (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]
Shares authorized	800,000,000
Common stock stated value per share	$ 0.01
Common shares outstanding	211,877,000	219,960,000
Stock repurchased	9,300,000
Weighted-average cost per share repurchased	$ 66
Stock repurchase program, covenant percentage	1.00%
Preferred stock shares authorized	2,000,000
Preferred stock stated value per share	$ 1.00
Preferred stock, shares outstanding	0
Treasury stock, shares, acquired from employees	200,000
2007 Authorization [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase authorization value	0
2014 Authorization [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase authorization value	0