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Acquisitions - Earnings from Acquired Businesses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]        
Total revenues $ 2,895 $ 2,644 $ 8,416 $ 7,674
Income before income taxes 530 $ 314 1,155 $ 854
Tax deferred exchange [member]        
Business Acquisition [Line Items]        
Total revenues 84   228  
Income before income taxes $ 10   $ 44