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Subsequent Event (Details) - USD ($)
$ / shares in Units, $ in Billions
3 Months Ended
Apr. 30, 2016
Jan. 30, 2016
Feb. 15, 2016
Subsequent Event [Line Items]      
StockRepurchaseProgramincreasedamountofauthorization   $ 0.6  
Stock Repurchase Program Remaining Authorized in Aggregate   $ 1.0  
Dividend Declared [Member]      
Subsequent Event [Line Items]      
Common stock cash dividends per share, declared     $ 0.42
Common stock cash dividends per share, declared date Feb. 15, 2016    
Common stock cash dividends per share, paid date Mar. 08, 2016    
Common stock cash dividends per share, date of record Feb. 26, 2016