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Subsequent (Details) (USD $)
Mar. 31, 2015
May 05, 2015
Subsequent Event [Line Items]    
Stock repurchase program, authorized amount $ 800,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Subsequent Event    
Subsequent Event [Line Items]    
Stock repurchase program, authorized amount   $ 1,200,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember