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Subsequent Events (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2015
Jul. 31, 2015
Jul. 01, 2015
Debt tender offer [Member]      
Subsequent Event [Line Items]      
Debt Instrument, Repurchased Face Amount     $ 794
Debt Instrument, Repurchased Amount Paid     $ 961
Gains (Losses) on Extinguishment of Debt   $ (172)  
Sale of Business [Member]      
Subsequent Event [Line Items]      
Proceeds from Divestiture of Businesses $ 440