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Investments - Investments - Securities Lending, Repurchase Agreements, and Other Collateral Transactions (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Securities Lending Transactions: |  |
Gross amount of securities on loan | $ 344 | $ 606
Gross amount of associated liability for collateral received | 352 | 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
Short-term investments | 2,505 | 2,921
Debt Securities [Member] |  |
Repurchase agreements: |  |
Debt Securities, Available-for-sale, Restricted | 573 | 447
Short-term investments |  |
Repurchase agreements: |  |
Short-term investments | 50 | 189
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 | $ 40 | $ 38

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