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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) - Credit Default Swap, Seller [Member] $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security | Mar. 31, 2019 USD ($)
Summary Of Credit Derivatives |  |  |
Maximum potential payout | $ 394 |  | $ 55
BBB+ [Member] |  |  |
Summary Of Credit Derivatives |  |  |
Maturity | Jun. 20, 2025 | Dec. 20, 2024 |
Credit rating of underlying obligation | BBB+ | BBB+ |
Number of instruments | security | 4 | 1 |
Fair value | $ (2) | $ 1 |
Maximum potential payout | $ 394 | $ 55 |

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