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Bank Loans and Related Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance at March 31, 2024 | $ 21 | $ 32 | $ 21 | $ 38 | $ 38
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | 1 | (12) | 1 | (18) |
Balance at June 30, 2024 | 22 | 20 | 22 | 20 | 21
Residential real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance at March 31, 2024 | 15 | 28 | 15 | 34 | 34
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | 1 | (13) | 1 | (19) |
Balance at June 30, 2024 | 16 | 15 | 16 | 15 | 15
Residential real estate | First Mortgages |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance at March 31, 2024 | 14 | 27 | 14 | 32 | 32
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | 1 | (13) | 1 | (18) |
Balance at June 30, 2024 | 15 | 14 | 15 | 14 | 14
Residential real estate | HELOCs |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance at March 31, 2024 | 1 | 1 | 1 | 2 | 2
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | 0 | 0 | 0 | (1) |
Balance at June 30, 2024 | 1 | 1 | 1 | 1 | 1
Pledged asset lines |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance at March 31, 2024 | 0 | 0 | 0 | 0 | 0
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | 0 | 0 | 0 | 0 |
Balance at June 30, 2024 | 0 | 0 | 0 | 0 | 0
Other |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance at March 31, 2024 | 6 | 4 | 6 | 4 | 4
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for credit losses | 0 | 1 | 0 | 1 |
Balance at June 30, 2024 | $ 6 | $ 5 | $ 6 | $ 5 | $ 6

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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