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Lending Activities - Credit Quality Performance Indicators for Commercial Mortgages (Details) $ in Millions | Dec. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Allowance for credit losses | $ 37,800 | $ 37,776 | $ 117 | $ 134
Commercial mortgage loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Number of Loans | loan | 190 | 213 |  |
Total | $ 3,305 | $ 3,836 |  |
Allowance for credit losses | $ 163 | $ 138 | $ 109 | $ 123
Percent of Total | 100.00% | 100.00% |  |
Percentage of total, allowance for credit losses | 5.00% | 4.00% |  |
Commercial mortgage loans | In good standing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Number of Loans | loan | 186 | 211 |  |
Total | $ 3,106 | $ 3,783 |  |
Percent of Total | 94.00% | 99.00% |  |
Commercial mortgage loans | 90 days or less delinquent |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Number of Loans | loan | 1 | 1 |  |
Total | $ 25 | $ 11 |  |
Percent of Total | 1.00% | 0.00% |  |
Commercial mortgage loans | >90 days delinquent or in process of foreclosure |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Number of Loans | loan | 3 | 1 |  |
Total | $ 174 | $ 42 |  |
Percent of Total | 5.00% | 1.00% |  |
Commercial mortgage loans | Apartments |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | $ 1,087 | $ 1,267 |  |
Allowance for credit losses | 5 | 9 |  |
Commercial mortgage loans | Apartments | In good standing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 1,087 | 1,267 |  |
Commercial mortgage loans | Apartments | 90 days or less delinquent |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Apartments | >90 days delinquent or in process of foreclosure |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Offices |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 1,108 | 1,223 |  |
Allowance for credit losses | 99 | 75 |  |
Commercial mortgage loans | Offices | In good standing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 971 | 1,212 |  |
Commercial mortgage loans | Offices | 90 days or less delinquent |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 25 | 11 |  |
Commercial mortgage loans | Offices | >90 days delinquent or in process of foreclosure |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 112 | 0 |  |
Commercial mortgage loans | Retail |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 432 | 518 |  |
Allowance for credit losses | 34 | 36 |  |
Commercial mortgage loans | Retail | In good standing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 370 | 476 |  |
Commercial mortgage loans | Retail | 90 days or less delinquent |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Retail | >90 days delinquent or in process of foreclosure |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 62 | 42 |  |
Commercial mortgage loans | Industrial |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 301 | 460 |  |
Allowance for credit losses | 11 | 7 |  |
Commercial mortgage loans | Industrial | In good standing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 301 | 460 |  |
Commercial mortgage loans | Industrial | 90 days or less delinquent |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Industrial | >90 days delinquent or in process of foreclosure |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Hotel |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 258 | 247 |  |
Allowance for credit losses | 13 | 9 |  |
Commercial mortgage loans | Hotel | In good standing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 258 | 247 |  |
Commercial mortgage loans | Hotel | 90 days or less delinquent |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Hotel | >90 days delinquent or in process of foreclosure |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Others |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 119 | 121 |  |
Allowance for credit losses | 1 | 2 |  |
Commercial mortgage loans | Others | In good standing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 119 | 121 |  |
Commercial mortgage loans | Others | 90 days or less delinquent |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | 0 | 0 |  |
Commercial mortgage loans | Others | >90 days delinquent or in process of foreclosure |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total | $ 0 | $ 0 |  |

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