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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) - Credit Default Swap, Seller [Member] $ in Millions | 12 Months Ended |
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Dec. 31, 2020 USD ($) security | Sep. 30, 2021 USD ($)
Summary Of Credit Derivatives |  |
Maximum potential payout | $ 51 |
BBB+ [Member] | Derivative Contract, Maturing 12-20-2025 [Member] |  |
Summary Of Credit Derivatives |  |
Maturity | Dec. 20, 2025 |
Credit rating of underlying obligation | BBB+ |
Number of instruments | security | 1 |
Fair value | $ 1 |
Maximum potential payout | $ 51 |

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