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Acquisitions - Pro Forma Information (Details) (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Pro forma revenues | $ $ 1,358
Pro forma net income | $ $ 796
Earnings Per Share, Pro Forma [Abstract]  
Basic | $ / shares $ 5.93
Diluted | $ / shares $ 5.89