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Segment Information - Amortization of Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | $ 1,372 | $ 1,377 | $ 1,364
Operating Segments | Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 1,009 | 973 | 951
Operating Segments | Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 309 | 348 | 359
Operating Segments | Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 33 | 31 | 31
Operating Segments | Mutual Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 21 | 24 | 22
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | $ 0 | $ 1 | $ 1

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