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Investments - Mortgage Loans, Residential by State (Details) - Geographic Concentration Risk - Residential mortgage loans - Mortgage Loans, Net | Jun. 30, 2023 | Dec. 31, 2022
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Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 100.00% | 100.00%
California |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 28.60% | 28.90%
Florida |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 10.70% | 9.70%
NEW YORK |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 6.40% | 5.60%
Other U.S. States |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 28.80% | 27.40%
Total U.S. Region |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 89.40% | 86.30%
UNITED KINGDOM |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 4.40% | 5.40%
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 6.20% | 8.30%
International |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 10.60% | 13.70%
NEW JERSEY |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 5.30% | 5.30%
ARIZONA |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 4.50% | 5.10%
TEXAS |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 5.10% | 4.30%

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