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Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 63,994 | $ 64,784
Other loans | 784 | 876
Total commercial mortgage and other loans | $ 64,554 | $ 65,425
% of Total | 100.00% | 100.00%
Net carrying value of commercial loans held for sale | $ 500 | $ 1,092
Commercial Mortgage Loans |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 59,900 | $ 60,736
% of Total | 93.60% | 93.80%
Commercial mortgage and agricultural property loans |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Allowance for credit losses | $ (217) | $ (227)
Total net loans | 63,777 | 64,557
Uncollateralized loans |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Other loans | 583 | 655
Residential property loans |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Other loans | 86 | 101
Other Collateralized Loans |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Other loans | 115 | 120
Other loans |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Total net loans | 777 | 868
Allowance for credit losses, Other loans | (7) | (8)
Office |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 12,555 | $ 12,750
% of Total | 19.60% | 19.70%
Retail |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 7,233 | $ 7,326
% of Total | 11.30% | 11.30%
Apartments/Multi-Family |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 17,642 | $ 18,330
% of Total | 27.60% | 28.30%
Industrial |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 15,228 | $ 14,954
% of Total | 23.80% | 23.10%
Hospitality |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 2,365 | $ 2,395
% of Total | 3.70% | 3.70%
Other |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 4,877 | $ 4,981
% of Total | 7.60% | 7.70%
Agricultural property loans |  |
Commercial Mortgage and Other Loans [Line Items] |  |
Commercial mortgage and agricultural property loans by property type | $ 4,094 | $ 4,048
% of Total | 6.40% | 6.20%

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