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Lending Activities - Credit Quality Performance Indicators for Commercial Mortgages (Details) $ in Millions | Jun. 30, 2024 USD ($) loan | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) loan | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 37,799 |  | $ 37,776 |  |  |
Commercial mortgage loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number of Loans | loan | 210 |  | 213 |  |  |
Total | $ 3,728 |  | $ 3,836 |  |  |
Allowance for credit losses | $ 162 | $ 150 | $ 138 | $ 116 | $ 119 | $ 109
Percent of Total | 100.00% |  | 100.00% |  |  |
Percentage of total, allowance for credit losses | 4.00% |  | 4.00% |  |  |
Commercial mortgage loans | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number of Loans | loan | 206 |  | 211 |  |  |
Total | $ 3,545 |  | $ 3,783 |  |  |
Percent of Total | 95.00% |  | 99.00% |  |  |
Commercial mortgage loans | 90 days or less delinquent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number of Loans | loan | 1 |  | 1 |  |  |
Total | $ 112 |  | $ 11 |  |  |
Percent of Total | 3.00% |  | 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 | $ 71 |  | $ 42 |  |  |
Percent of Total | 2.00% |  | 1.00% |  |  |
Commercial mortgage loans | Apartments |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | $ 1,241 |  | $ 1,267 |  |  |
Allowance for credit losses | 6 |  | 9 |  |  |
Commercial mortgage loans | Apartments | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 1,241 |  | 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 | 1,195 |  | 1,223 |  |  |
Allowance for credit losses | 99 |  | 75 |  |  |
Commercial mortgage loans | Offices | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 1,073 |  | 1,212 |  |  |
Commercial mortgage loans | Offices | 90 days or less delinquent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 112 |  | 11 |  |  |
Commercial mortgage loans | Offices | >90 days delinquent or in process of foreclosure |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 10 |  | 0 |  |  |
Commercial mortgage loans | Retail |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 483 |  | 518 |  |  |
Allowance for credit losses | 34 |  | 36 |  |  |
Commercial mortgage loans | Retail | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 422 |  | 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 | 61 |  | 42 |  |  |
Commercial mortgage loans | Industrial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 446 |  | 460 |  |  |
Allowance for credit losses | 9 |  | 7 |  |  |
Commercial mortgage loans | Industrial | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 446 |  | 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 | 243 |  | 247 |  |  |
Allowance for credit losses | 12 |  | 9 |  |  |
Commercial mortgage loans | Hotel | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 243 |  | 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 | 120 |  | 121 |  |  |
Allowance for credit losses | 2 |  | 2 |  |  |
Commercial mortgage loans | Others | In good standing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total | 120 |  | 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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