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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Region (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | [1]
Financing receivables - credit quality information |  |  |  |
Less: allowance for loan losses | $ 51 | $ 68 | $ 71 | $ 51
Commercial Loans |  |  |  |
Financing receivables - credit quality information |  |  |  |
Less: allowance for loan losses | 48 | 66 | $ 67 | $ 51
Commercial Loans | Commercial mortgage loans |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 1,901 | 2,725 |  |
Less: allowance for loan losses | 14 | 29 |  |
Total loans | 1,887 | 2,696 |  |
Commercial Loans | Commercial mortgage loans | East North Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 187 | 259 |  |
Commercial Loans | Commercial mortgage loans | East South Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 69 | 115 |  |
Commercial Loans | Commercial mortgage loans | Middle Atlantic |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 125 | 178 |  |
Commercial Loans | Commercial mortgage loans | Mountain |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 124 | 247 |  |
Commercial Loans | Commercial mortgage loans | New England |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 29 | 54 |  |
Commercial Loans | Commercial mortgage loans | Pacific |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 608 | 825 |  |
Commercial Loans | Commercial mortgage loans | South Atlantic |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 496 | 681 |  |
Commercial Loans | Commercial mortgage loans | West North Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | 140 | 198 |  |
Commercial Loans | Commercial mortgage loans | West South Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Loans | $ 123 | $ 168 |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 100.00% | 100.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | East North Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 10.00% | 10.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | East South Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 4.00% | 4.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Middle Atlantic |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 7.00% | 7.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Mountain |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 6.00% | 9.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | New England |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 2.00% | 2.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Pacific |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 32.00% | 30.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | South Atlantic |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 26.00% | 25.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | West North Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 7.00% | 7.00% |  |
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | West South Central |  |  |  |
Financing receivables - credit quality information |  |  |  |
Percentage of total | 6.00% | 6.00% |  |
[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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