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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, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
Summary Of Credit Derivatives |  |
Maximum potential payout | $ 85 | $ 51
BBB+ [Member] | Derivative Contract, Maturing 12-20-2025 [Member] |  |
Summary Of Credit Derivatives |  |
Maturity | Dec. 20, 2025 | Dec. 20, 2025
Credit rating of underlying obligation | BBB+ | BBB+
Number of instruments | security | 1 | 1
Fair value |  | $ 1
Maximum potential payout | $ 20 | $ 51
BBB+ [Member] | Derivative Contract, Maturing 6-20-2026 [Member] |  |
Summary Of Credit Derivatives |  |
Maturity | Jun. 20, 2026 |
Credit rating of underlying obligation | BBB+ |
Number of instruments | security | 1 |
Fair value | $ 2 |
Maximum potential payout | $ 65 |

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