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 |