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Investments - Investments - Securities Lending, Repurchase Agreements, and Other Collateral Transactions (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Securities Lending Transactions: |  |
Gross amount of securities on loan | $ 585 | $ 820
Gross amount of associated liability for collateral received | 599 | 840
Repurchase agreements: |  |
Gross amount of recognized liabilities for repurchase agreements | 154 | 72
Gross amount of collateral pledged related to repurchase agreements | 158 | 73
Securities for Reverse Repurchase Agreements | 54 | 64
Securities Loaned, Collateral, Obligation to Return Securities | 18 | 3
Assets Held by Insurance Regulators | 2,400 | 2,200
Short-term investments | 2,364 | 4,283
Debt Securities [Member] |  |
Repurchase agreements: |  |
Debt Securities, Available-for-sale, Restricted | 489 |
Short-term Investments [Member] |  |
Repurchase agreements: |  |
Short-term investments | 1 |
US Treasury Securities [Member] |  |
Repurchase agreements: |  |
Debt Securities, Available-for-sale, Restricted | $ 36 | 47
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 | $ 49 | $ 0

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