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Bank Loans and Related Allowance for Credit Losses - Composition of Bank Loans and Delinquency Analysis by Loan Segment (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | $ 50,427,000,000 | $ 45,236,000,000 |  |  |  |
Allowance for credit losses | 22,000,000 | 21,000,000 | $ 21,000,000 | $ 20,000,000 | $ 32,000,000 | $ 38,000,000
Total bank loans – net | 50,405,000,000 | 45,215,000,000 |  |  |  |
Loans accruing interest contractually 90 days or more past due | 0 | 0 |  |  |  |
Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 50,319,000,000 | 45,150,000,000 |  |  |  |
Total past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 108,000,000 | 86,000,000 |  |  |  |
30-59 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 63,000,000 | 45,000,000 |  |  |  |
60-89 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 8,000,000 | 6,000,000 |  |  |  |
More than or equal to 90 days past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 37,000,000 | 35,000,000 |  |  |  |
Residential real estate |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 28,965,000,000 | 27,813,000,000 |  |  |  |
Allowance for credit losses | 16,000,000 | 15,000,000 | 15,000,000 | 15,000,000 | 28,000,000 | 34,000,000
Total bank loans – net | 28,949,000,000 | 27,798,000,000 |  |  |  |
Unamortized premiums and discounts and direct origination costs | $ 120,000,000 | $ 112,000,000 |  |  |  |
Residential real estate | Loans Geographic Area | California | Geographic Concentration Risk |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Concentration risk percentage | 42.00% | 42.00% |  |  |  |
Residential real estate | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | $ 28,890,000,000 | $ 27,742,000,000 |  |  |  |
Residential real estate | Total past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 75,000,000 | 71,000,000 |  |  |  |
Residential real estate | 30-59 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 33,000,000 | 37,000,000 |  |  |  |
Residential real estate | 60-89 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 7,000,000 | 6,000,000 |  |  |  |
Residential real estate | More than or equal to 90 days past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 35,000,000 | 28,000,000 |  |  |  |
Residential real estate | First Mortgages |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 28,542,000,000 | 27,389,000,000 |  |  |  |
Allowance for credit losses | 15,000,000 | 14,000,000 | 14,000,000 | 14,000,000 | 27,000,000 | 32,000,000
Total bank loans – net | 28,527,000,000 | 27,375,000,000 |  |  |  |
Residential real estate | First Mortgages | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 28,470,000,000 | 27,321,000,000 |  |  |  |
Residential real estate | First Mortgages | Total past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 72,000,000 | 68,000,000 |  |  |  |
Residential real estate | First Mortgages | 30-59 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 32,000,000 | 37,000,000 |  |  |  |
Residential real estate | First Mortgages | 60-89 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 7,000,000 | 6,000,000 |  |  |  |
Residential real estate | First Mortgages | More than or equal to 90 days past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 33,000,000 | 25,000,000 |  |  |  |
Residential real estate | HELOCs |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 423,000,000 | 424,000,000 |  |  |  |
Allowance for credit losses | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | 2,000,000
Total bank loans – net | 422,000,000 | 423,000,000 |  |  |  |
Residential real estate | HELOCs | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 420,000,000 | 421,000,000 |  |  |  |
Residential real estate | HELOCs | Total past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 3,000,000 | 3,000,000 |  |  |  |
Residential real estate | HELOCs | 30-59 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 1,000,000 | 0 |  |  |  |
Residential real estate | HELOCs | 60-89 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 0 | 0 |  |  |  |
Residential real estate | HELOCs | More than or equal to 90 days past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 2,000,000 | 3,000,000 |  |  |  |
Pledged asset lines |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 21,038,000,000 | 17,024,000,000 |  |  |  |
Allowance for credit losses | 0 | 0 | 0 | 0 | 0 | 0
Total bank loans – net | 21,038,000,000 | 17,024,000,000 |  |  |  |
Pledged asset lines | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 21,006,000,000 | 17,010,000,000 |  |  |  |
Pledged asset lines | Total past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 32,000,000 | 14,000,000 |  |  |  |
Pledged asset lines | 30-59 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 30,000,000 | 8,000,000 |  |  |  |
Pledged asset lines | 60-89 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 1,000,000 | 0 |  |  |  |
Pledged asset lines | More than or equal to 90 days past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 1,000,000 | 6,000,000 |  |  |  |
Other |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 424,000,000 | 399,000,000 |  |  |  |
Allowance for credit losses | 6,000,000 | 6,000,000 | $ 6,000,000 | $ 5,000,000 | $ 4,000,000 | $ 4,000,000
Total bank loans – net | 418,000,000 | 393,000,000 |  |  |  |
Other | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 423,000,000 | 398,000,000 |  |  |  |
Other | Total past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 1,000,000 | 1,000,000 |  |  |  |
Other | 30-59 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 0 | 0 |  |  |  |
Other | 60-89 days past due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 0 | 0 |  |  |  |
Other | More than or equal to 90 days past due and other nonaccrual loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | $ 1,000,000 | $ 1,000,000 |  |  |  |

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