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Business Acquisitions - Pro Forma Information (Details) - Aetna Group Insurance - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |
Total Revenue | $ 4,777 | $ 14,309
Net Income | $ 249 | $ 619

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