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Acquisitions and Sale of Businesses - Impact of the sale of subsidiaries sold (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 24, 2015 | Jun. 30, 2016 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Liabilities of businesses sold: |  |  |  |  |  |  |
Realized gains (losses) on subsidiaries |  |  |  |  | $ 0 | $ 2 | $ (161)
Run-off long-term care insurance business |  |  |  |  |  |  |
Sale of Businesses |  |  |  |  |  |  |
Net sale proceeds | [1] | $ 13 |  |  |  |  |
Assets of businesses sold: |  |  |  |  |  |  |
Cash and investments |  | 1,334 |  |  |  |  |
Recoverables from reinsurers |  | 630 |  |  |  |  |
Deferred policy acquisition costs |  | 16 |  |  |  |  |
Other receivables |  | 16 |  |  |  |  |
Other assets |  | (4) |  |  |  |  |
Goodwill |  | 2 |  |  |  |  |
Total assets |  | 1,994 |  |  |  |  |
Liabilities of businesses sold: |  |  |  |  |  |  |
Annuity benefits accumulated |  | 261 |  |  |  |  |
Life, accident and health reserves |  | 1,525 |  |  |  |  |
Other liabilities |  | 7 |  |  |  |  |
Total liabilities |  | 1,793 |  |  |  |  |
Reclassify net unrealized gain on marketable securities |  | 22 |  |  |  |  |
Net assets of businesses sold |  | 179 |  |  |  |  |
Realized gains (losses) on subsidiaries |  | (166) | $ 2 | $ (162) |  |  |
Tax benefit |  | 58 |  |  |  |  |
Loss on subsidiaries, net of tax |  | $ (108) |  | $ (105) |  |  |
[1] | Includes the fair value of the potential additional consideration and capital maintenance agreement and is shown net of estimated expenses.

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- Definition The net value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date. + References No definition available. + Details
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