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Managed Investment Entities - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) collateralizedloanobligation | Dec. 31, 2018 USD ($) collateralizedloanobligation | Dec. 31, 2017 USD ($) collateralizedloanobligation
Variable Interest Entity [Line Items] |  |  |
Percentage of investment of most subordinate debt tranche, Minimum | 15.00% |  |
Percentage of investment of most subordinate debt tranche, Maximum | 60.90% |  |
Number of collateralized loan obligation entities | collateralizedloanobligation | 11 |  |
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities |  | $ 45 | $ 103
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date |  | 7 | 71
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date |  | $ 7 | $ 71
Number of collateralized loan obligation entities formed during the period | collateralizedloanobligation |  | 1 | 2
Number of collateralized loan obligation entities that were substantially liquidated during the period | collateralizedloanobligation |  | 1 | 2
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments | $ 146 | $ 232 |
Difference between aggregate unpaid principal balance and fair value of CLOs' debt | 129 | 241 |
Carrying amount of CLO loans in default | 10 |  |
Aggregate unpaid principal balance of CLO loans in default | 25 | 0 |
Available for sale (AFS) fixed maturities | 46,505 | 41,997 |
Variable interest entity, primary beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate fair value of investment in collateralized loan obligations | 165 | 188 | $ 215
New collateralized loan obligation entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Face value of liabilities issued by managed investment entities on issuance date |  | 463 | 865
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date |  | 31 | $ 48
Subordinated debt obligations | Variable interest entity, primary beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate fair value of investment in collateralized loan obligations | 102 |  |
Collateralized loan obligations |  |  |
Variable Interest Entity [Line Items] |  |  |
Available for sale (AFS) fixed maturities | 4,280 | 4,278 |
Collateralized loan obligations | Managed by third parties |  |  |
Variable Interest Entity [Line Items] |  |  |
Available for sale (AFS) fixed maturities | 4,280 | $ 4,280 |
Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities | $ 1 |  |

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