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Business Dispositions and Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 | Jan. 01, 2018 | Dec. 03, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on discontinued operations |  |  |  |  |  |  | $ (213) | $ 0 |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  | $ (88) |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  |  |  |  | $ (193) |  |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  |  |  |  | (133) |  |  |
Cumulative effect of accounting change net of income taxes |  | $ 10 |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale [Member] | 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 |  |  |  |  |  |  |  |  |
Dividends paid | $ 300 |  |  |  |  |  |  |  |  |
Ownership interest retained, percentage | 970.00% |  |  |  |  |  |  |  |  |
Ownership interest retained | $ 164 |  |  |  |  |  |  |  |  |
Reduction in long term debt | 142 |  |  |  |  |  |  |  |  | $ 142
Consideration received | $ 1,500 |  |  |  |  |  |  |  |  |
Loss on discontinued operations |  |  |  |  |  |  |  |  | $ 3,000 | 3,300
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  | $ 151 |  | $ 0 | 213 | 0 |  |
Disposal Group, Including Discontinued Operation, Operating Income (Loss) |  |  |  |  |  |  | 104 |  |  |
Adjustments to AOCI |  |  |  |  |  |  |  |  |  | 1,000
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax |  |  |  | (9) |  | $ 143 | 113 | $ 227 |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustments to AOCI |  |  |  | $ 758 |  |  | $ 758 |  | $ 758 |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  |  |  |  | $ (193) |  |  |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change net of income taxes |  |  |  |  |  |  |  |  |  | $ 273
Asset Management Income [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Management agreement term |  |  | 5 years |  |  |  |  |  |  |
Other Income [Member] | Discontinued Operations, Held-for-sale [Member] | Minimum |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Management agreement term |  |  | 12 months |  |  |  |  |  |  |
Other Income [Member] | Discontinued Operations, Held-for-sale [Member] | Maximum |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Management agreement term |  |  | 24 months |  |  |  |  |  |  |

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