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Investments - Investments - Securities Lending, Repurchase Agreements, and Other Collateral Transactions (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Securities Lending Transactions: |  |
Gross amount of securities on loan | $ 165 | $ 606
Gross amount of associated liability for collateral received | 169 | 621
Repurchase agreements: |  |
Securities for Reverse Repurchase Agreements | 14 | 15
Securities Loaned, Collateral, Obligation to Return Securities | 0 | 34
Assets Held by Insurance Regulators | 2,500 | 2,300
US Treasury Securities [Member] |  |
Repurchase agreements: |  |
Debt Securities, Available-for-sale, Restricted | $ 34 | 37
Minimum |  |
Repurchase agreements: |  |
Securities Sold Under Agreements to Repurchase, Percentage of Fair Value Required to be Paid in Cash at Sale | 95.00% |
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Repurchase agreements: |  |
Deposit Assets | $ 48 | 38
Syndicate Policyholders [Member] | Debt Securities [Member] |  |
Repurchase agreements: |  |
Debt Securities, Available-for-sale, Restricted | 604 | 447
Syndicate Policyholders [Member] | Short-term investments |  |
Repurchase agreements: |  |
Restricted Investments, Current | 24 | $ 189
Lloyd's of London [Member] | Debt Securities [Member] |  |
Repurchase agreements: |  |
Debt Securities, Available-for-sale, Restricted | $ 64 |

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