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Common Stock - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 11, 2014
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2015
Jun. 05, 2013
Common Stock [Abstract]          
Temporary Equity, Share Subscriptions     57.5 57.5  
Shares Issued, Price Per Share         $ 35
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions $ 35        
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share   $ 32.48      
Junior Subordinated Notes, Noncurrent         $ 1,150
Forward Contract Indexed to Issuer's Equity, Indexed Shares         23.0
Proceeds from Issuance of Common Stock     $ 1,870 $ 1,868