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Investments - Mortgage Loans, Net by Property Type and Geographic Region (Details) - Commercial mortgage loans - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 22,871 | $ 20,108
Property Type Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 100.00% | 100.00%
Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 100.00% | 100.00%
Total U.S. Region |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 19,240 | $ 16,860
Total U.S. Region | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 84.10% | 83.90%
East North Central |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 1,471 | $ 1,437
East North Central | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 6.40% | 7.10%
East South Central |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 429 | $ 413
East South Central | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 1.90% | 2.10%
Middle Atlantic |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 5,960 | $ 5,183
Middle Atlantic | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 26.10% | 25.80%
Mountain |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 987 | $ 898
Mountain | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 4.30% | 4.50%
New England |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 1,123 | $ 1,076
New England | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 4.90% | 5.40%
Pacific |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 4,231 | $ 3,781
Pacific | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 18.50% | 18.80%
South Atlantic |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 3,802 | $ 2,756
South Atlantic | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 16.60% | 13.70%
West North Central |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 203 | $ 231
West North Central | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 0.90% | 1.10%
West South Central |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 1,034 | $ 1,085
West South Central | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 4.50% | 5.40%
UNITED KINGDOM |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 2,167 | $ 1,898
UNITED KINGDOM | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 9.50% | 9.40%
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 1,464 | $ 1,350
Other | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 6.40% | 6.70%
International |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 3,631 | $ 3,248
International | Geographic Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 15.90% | 16.10%
Hotels |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 2,138 | $ 1,855
Hotels | Property Type Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 9.30% | 9.20%
Retail |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 1,666 | $ 1,454
Retail | Property Type Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 7.30% | 7.20%
Office building |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 4,426 | $ 4,651
Office building | Property Type Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 19.40% | 23.10%
Industrial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 2,609 | $ 2,047
Industrial | Property Type Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 11.40% | 10.20%
Apartment |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 8,217 | $ 6,692
Apartment | Property Type Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 35.90% | 33.30%
Other commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans, net of allowances | $ 3,815 | $ 3,409
Other commercial | Property Type Concentration Risk | Mortgage Loans, Net |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage concentration risk | 16.70% | 17.00%

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