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Business Dispositions and Discontinued Operations - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 03, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on discontinued operations |  |  | $ (62,000,000) | $ 0 |
OCI, before Reclassifications |  |  | (920,000,000) | 157,000,000 |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash proceeds from sale of business |  | $ 1,400,000,000.0 |  |  |
Dividends paid |  | $ 300,000,000 |  |  |
Ownership interest retained, percentage |  | 970.00% |  |  |
Ownership interest retained |  | $ 164,000,000 |  |  |
Reduction in long term debt |  | 142,000,000 | 142,000,000 |  | $ 142,000,000
Consideration received |  | $ 1,500,000,000 |  |  |
Loss on discontinued operations |  |  | 3,200,000,000 |  | 3,300,000,000
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  | 62,000,000 | 0 |
Adjustments to AOCI |  |  | 900,000,000 |  | $ 1,000,000,000
Management agreement term |  | 5 years |  |  |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business | Minimum |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Transition services agreement term |  | 12 months |  |  |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business | Maximum |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Transition services agreement term |  | 24 months |  |  |
Discontinued Operations [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  | 0 |  |
Net Unrealized Gain on Securities |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
OCI, before Reclassifications | $ 83,000,000 |  | $ (882,000,000) | $ 160,000,000 |
Net Unrealized Gain on Securities | Discontinued Operations [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
OCI, before Reclassifications | $ 10,000,000 |  |  |  |

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