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Stockholders' Equity Repurchase Program (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Apr. 14, 2014
Repurchase Program [Abstract]    
Stock repurchase program, authorized amount   $ 500us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchased during period, shares 0us-gaap_StockRepurchasedDuringPeriodShares  
Stock repurchase program, remaining authorized repurchase amount $ 475us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1