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Lending Activities - Credit Quality Performance Indicators for Commercial Mortgages (Details) $ in Millions | Sep. 30, 2025 USD ($) loan | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) loan | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 37,740 |  | $ 37,800 |  |  |
Commercial mortgage loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number of Loans | loan | 162 |  | 190 |  |  |
Total | $ 2,869 |  | $ 3,305 |  |  |
Allowance for credit losses | $ 104 | $ 106 | $ 163 | $ 165 | $ 162 | $ 138
Percent of Total | 100.00% |  | 100.00% |  |  |
Percentage of total, allowance for credit losses | 4.00% |  | 5.00% |  |  |
Commercial mortgage loans | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number of Loans | loan | 158 |  | 186 |  |  |
Total | $ 2,779 |  | $ 3,106 |  |  |
Percent of Total | 97.00% |  | 94.00% |  |  |
Commercial mortgage loans | 90 days or less delinquent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number of Loans | loan | 0 |  | 1 |  |  |
Total | $ 0 |  | $ 25 |  |  |
Percent of Total | 0.00% |  | 1.00% |  |  |
Commercial mortgage loans | >90 days delinquent or in process of foreclosure |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number of Loans | loan | 4 |  | 3 |  |  |
Total | $ 90 |  | $ 174 |  |  |
Percent of Total | 3.00% |  | 5.00% |  |  |
Commercial mortgage loans | Apartments |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | $ 908 |  | $ 1,087 |  |  |
Allowance for credit losses | 1 |  | 5 |  |  |
Commercial mortgage loans | Apartments | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 908 |  | 1,087 |  |  |
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 | 1,033 |  | 1,108 |  |  |
Allowance for credit losses | 59 |  | 99 |  |  |
Commercial mortgage loans | Offices | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 1,004 |  | 971 |  |  |
Commercial mortgage loans | Offices | 90 days or less delinquent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 0 |  | 25 |  |  |
Commercial mortgage loans | Offices | >90 days delinquent or in process of foreclosure |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 29 |  | 112 |  |  |
Commercial mortgage loans | Retail |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 391 |  | 432 |  |  |
Allowance for credit losses | 33 |  | 34 |  |  |
Commercial mortgage loans | Retail | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 330 |  | 370 |  |  |
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 | 61 |  | 62 |  |  |
Commercial mortgage loans | Industrial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 208 |  | 301 |  |  |
Allowance for credit losses | 1 |  | 11 |  |  |
Commercial mortgage loans | Industrial | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 208 |  | 301 |  |  |
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 | 203 |  | 258 |  |  |
Allowance for credit losses | 10 |  | 13 |  |  |
Commercial mortgage loans | Hotel | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 203 |  | 258 |  |  |
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 | 126 |  | 119 |  |  |
Allowance for credit losses | 0 |  | 1 |  |  |
Commercial mortgage loans | Others | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 126 |  | 119 |  |  |
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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