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Commitments, Contingencies and Other Items (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Commitments and Contingencies [Line Items] |  |
Initial commitments | $ 2,700,000,000 |
Fulfilled commitments | 1,300,000,000 |
Unfunded commitments | $ 1,400,000,000 |
Operating lease, weighted average lease term | 4 years 8 months 12 days |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets | Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities
Operating lease, expense | $ 8,400,000 | $ 9,800,000
Lessee, finance lease, term of contract | 20 years |
Lessee, finance lease, renewal term | 30 years |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets | Other assets
Finance Lease, Liability, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities
Letter of Credit |  |
Commitments and Contingencies [Line Items] |  |
Letters of credit outstanding | $ 1,100,000,000 |
Letter of Credit | Top Layer Reinsurance Ltd. |  |
Commitments and Contingencies [Line Items] |  |
Collateral pledged to support letter of credit | 37,500,000 |
Letter of Credit | Capital Support Agreement | Top Layer Reinsurance Ltd. |  |
Commitments and Contingencies [Line Items] |  |
Maximum mandatory capital contribution in the event of loss that reduced capital and surplus below specified level | 50,000,000 |
Other assets |  |
Commitments and Contingencies [Line Items] |  |
Operating lease, right-of-use asset | 22,900,000 | $ 29,800,000
Finance lease, right-of-use asset | 28,000,000 | 18,000,000
Other liabilities |  |
Commitments and Contingencies [Line Items] |  |
Operating lease, liability | 23,100,000 | 29,900,000
Finance lease, liability | 22,500,000 | 22,900,000
Interest Expense |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, interest expense | 2,300,000 | 2,300,000
Other income (loss) |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, right-of-use asset, amortization | $ 500,000 | $ 500,000

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