Equity (Share Activity) (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Feb. 25, 2016
2016 Share Repurchase Program [Member]
Equity, Treasury Stock [Line Items]
Share repurchase program, amount authorized, value			$ 100
2016 Share Repurchase Program [Member] | Treasury Stock, Common [Member]
Equity, Treasury Stock [Line Items]
Common stock repurchases (in shares)	0
2014 Share Repurchase Program [Member]
Equity, Treasury Stock [Line Items]
Treasury stock, aggregate purchase price		$ 100
2014 Share Repurchase Program [Member] | Treasury Stock, Common [Member]
Equity, Treasury Stock [Line Items]
Common stock repurchases (in shares)		5,200,000