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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Property Type (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | [1]
Concentrations of credit risk by property type |  |  |  |
Less: allowance for loan losses | $ 51 | $ 68 | $ 71 | $ 51
Commercial Loans |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Less: allowance for loan losses | 48 | 66 | $ 67 | $ 51
Commercial Loans | Commercial mortgage loans |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 1,901 | 2,725 |  |
Less: allowance for loan losses | 14 | 29 |  |
Total loans | 1,887 | 2,696 |  |
Commercial Loans | Commercial mortgage loans | Apartment Building |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 499 | 713 |  |
Commercial Loans | Commercial mortgage loans | Hotel |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 15 | 50 |  |
Commercial Loans | Commercial mortgage loans | Industrial |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 306 | 427 |  |
Commercial Loans | Commercial mortgage loans | Mixed use |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 68 | 87 |  |
Commercial Loans | Commercial mortgage loans | Office |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 272 | 372 |  |
Commercial Loans | Commercial mortgage loans | Retail |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | 625 | 881 |  |
Commercial Loans | Commercial mortgage loans | Other |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Loans | $ 116 | $ 195 |  |
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 | Apartment Building |  |  |  |
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% | 2.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Industrial |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 16.00% | 16.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Mixed use |  |  |  |
Concentrations of credit risk by property type |  |  |  |
Percentage of total | 4.00% | 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 | 33.00% | 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 | 6.00% | 7.00% |  |
[1] | Prior to January 1, 2020, the allowance for credit losses was based on an incurred loss model that did not require estimating expected credit losses over the expected life of the asset.

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