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Business Dispositions and Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 31, 2018 | Jan. 01, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss on discontinued operations |  |  |  |  |  |  | $ (202) | $ 0 |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  | $ (88) |  |  |  |  |  |  |
Income (Loss) from Ongoing Equity Method Investment in Discontinued Operation after Disposal |  |  | $ 2 |  |  |  | 2 |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
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 | 9.70% |  |  |  |  |  |  |  |
Ownership interest retained | $ 164 |  |  |  |  |  |  |  |
Reduction in long term debt | 142 |  |  |  |  |  |  |  | $ 142
Consideration received | $ 1,500 |  |  |  |  |  |  |  |
Loss on discontinued operations |  |  |  |  |  | $ 3,100 |  |  | 3,300
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  | (11) |  | $ 0 |  | 202 | 0 |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  |  |  | $ (193) |  |  |  |  |
Adjustments to AOCI |  |  | 758 |  |  |  | 758 |  | $ 1,000
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax |  |  | $ 9 |  | $ 77 |  | 122 | $ 304 |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Shadow DAC [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  |  |  | 10 |  |
Operating Income (Loss) [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  |  |  | 104 |  |
Asset Management Income [Member] | Discontinued Operations, Held-for-sale or Disposed of by 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 or Disposed of by Sale [Member] | Maximum |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Management agreement term | 24 months |  |  |  |  |  |  |  |
Equity [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  | $ (193) |  |  |  |  |
Deferred Tax Asset [Domain] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  |  |  | $ (141) |  |

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