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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Property Type (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Concentrations of credit risk by property type |  |  |  |
Less: allowance for loan losses | $ 48 | $ 50 | $ 68 | $ 68
Commercial Loans |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Less: allowance for loan losses | 45 | 47 | $ 65 | $ 66
Commercial Loans | Commercial mortgage loans |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 1,934 | 1,916 |  |
Less: allowance for loan losses | 12 | 12 |  |
Total loans | 1,922 | 1,904 |  |
Commercial Loans | Commercial mortgage loans | Apartments |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 512 | 496 |  |
Commercial Loans | Commercial mortgage loans | Hotel |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 15 | 14 |  |
Commercial Loans | Commercial mortgage loans | Industrial |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 321 | 319 |  |
Commercial Loans | Commercial mortgage loans | Mixed use |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 67 | 68 |  |
Commercial Loans | Commercial mortgage loans | Office |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 266 | 271 |  |
Commercial Loans | Commercial mortgage loans | Retail |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 617 | 617 |  |
Commercial Loans | Commercial mortgage loans | Other |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | $ 136 | $ 131 |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 100.00% | 100.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Apartments |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 26.00% | 26.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Hotel |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 1.00% | 1.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Industrial |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 17.00% | 17.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Mixed use |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 3.00% | 3.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Office |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 14.00% | 14.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Retail |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 32.00% | 32.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Other |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 7.00% | 7.00% |  |

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