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Bank Loans and Related Allowance for Credit Losses - Credit Quality Indicators of Bank Loan Portfolio (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
Gross charge-offs |  |  |  |  |
Total loans | $ 0 | $ 0 | $ 0 | $ 0 |
Residential real estate |  |  |  |  |
Gross charge-offs |  |  |  |  |
Total loans | 0 | 0 | 0 | 0 |
Residential real estate | First Mortgages |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 2,536 |  | 2,536 |  |
2024 | 3,272 |  | 3,272 |  | $ 3,589
2023 | 1,982 |  | 1,982 |  | 2,148
2022 | 5,460 |  | 5,460 |  | 5,654
2021 | 10,542 |  | 10,542 |  | 10,917
pre-2021 | 4,750 |  | 4,750 |  | 5,081
Total loans | 28,542 |  | 28,542 |  | 27,389
Gross charge-offs |  |  |  |  |
2025 |  |  | 0 |  |
2024 |  |  | 0 |  | 0
2023 |  |  | 0 |  | 0
2022 |  |  | 0 |  | 0
2021 |  |  | 0 |  | 0
pre-2021 |  |  | 0 |  | 0
Total loans | $ 0 | 0 | $ 0 | 0 | $ 0
Percent of Loans on Nonaccrual Status |  |  |  |  |
2025 | 0.01% |  | 0.01% |  |
2024 | 0.05% |  | 0.05% |  | 0.01%
2023 | 0.22% |  | 0.22% |  | 0.12%
2022 | 0.09% |  | 0.09% |  | 0.16%
2021 | 0.09% |  | 0.09% |  | 0.04%
pre-2021 | 0.26% |  | 0.26% |  | 0.18%
Total loans | 0.12% |  | 0.12% |  | 0.09%
Residential real estate | First Mortgages | Estimated Current Loan To Value Ratio 70% and Below |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | $ 1,704 |  | $ 1,704 |  |
2024 | 2,357 |  | 2,357 |  | $ 2,402
2023 | 1,658 |  | 1,658 |  | 1,660
2022 | 4,942 |  | 4,942 |  | 4,942
2021 | 10,442 |  | 10,442 |  | 10,747
pre-2021 | 4,735 |  | 4,735 |  | 5,057
Total loans | 25,838 |  | 25,838 |  | 24,808
Residential real estate | First Mortgages | Estimated Current Loan To Value Ratio Greater Than 70% Through 90% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 831 |  | 831 |  |
2024 | 915 |  | 915 |  | 1,187
2023 | 324 |  | 324 |  | 487
2022 | 508 |  | 508 |  | 693
2021 | 99 |  | 99 |  | 166
pre-2021 | 13 |  | 13 |  | 20
Total loans | 2,690 |  | 2,690 |  | 2,553
Residential real estate | First Mortgages | Estimated Current LTV Greater Than 90% Through 100% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 1 |  | 1 |  |
2024 | 0 |  | 0 |  | 0
2023 | 0 |  | 0 |  | 1
2022 | 10 |  | 10 |  | 17
2021 | 1 |  | 1 |  | 3
pre-2021 | 2 |  | 2 |  | 4
Total loans | 14 |  | 14 |  | 25
Residential real estate | First Mortgages | Estimated Current LTV Greater Than 100% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024 |  |  |  |  | 0
2023 |  |  |  |  | 0
2022 |  |  |  |  | 2
2021 |  |  |  |  | 1
pre-2021 |  |  |  |  | 0
Total loans |  |  |  |  | 3
Residential real estate | First Mortgages | Updated FICO Score Below 620 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 1 |  | 1 |  |
2024 | 1 |  | 1 |  | 0
2023 | 5 |  | 5 |  | 3
2022 | 20 |  | 20 |  | 25
2021 | 20 |  | 20 |  | 15
pre-2021 | 23 |  | 23 |  | 21
Total loans | 70 |  | 70 |  | 64
Residential real estate | First Mortgages | Updated FICO Score 620 Through 679 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 23 |  | 23 |  |
2024 | 37 |  | 37 |  | 34
2023 | 26 |  | 26 |  | 31
2022 | 70 |  | 70 |  | 74
2021 | 97 |  | 97 |  | 97
pre-2021 | 64 |  | 64 |  | 74
Total loans | 317 |  | 317 |  | 310
Residential real estate | First Mortgages | Updated FICO Score 680 Through 739 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 231 |  | 231 |  |
2024 | 271 |  | 271 |  | 339
2023 | 183 |  | 183 |  | 191
2022 | 503 |  | 503 |  | 574
2021 | 807 |  | 807 |  | 871
pre-2021 | 401 |  | 401 |  | 435
Total loans | 2,396 |  | 2,396 |  | 2,410
Residential real estate | First Mortgages | Updated FICO Score 740 and Above |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 2,281 |  | 2,281 |  |
2024 | 2,963 |  | 2,963 |  | 3,216
2023 | 1,768 |  | 1,768 |  | 1,923
2022 | 4,867 |  | 4,867 |  | 4,981
2021 | 9,618 |  | 9,618 |  | 9,934
pre-2021 | 4,262 |  | 4,262 |  | 4,551
Total loans | 25,759 |  | 25,759 |  | 24,605
Residential real estate | First Mortgages | Financial Asset Originated |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 2,536 |  | 2,536 |  |
2024 | 3,272 |  | 3,272 |  | 3,589
2023 | 1,982 |  | 1,982 |  | 2,148
2022 | 5,460 |  | 5,460 |  | 5,654
2021 | 10,542 |  | 10,542 |  | 10,917
pre-2021 | 4,750 |  | 4,750 |  | 5,081
Total loans | 28,542 |  | 28,542 |  | 27,389
Residential real estate | First Mortgages | Financial Asset Originated | Origination Loan to Value Ratio 70% and Below |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 1,714 |  | 1,714 |  |
2024 | 2,248 |  | 2,248 |  | 2,471
2023 | 1,337 |  | 1,337 |  | 1,445
2022 | 4,057 |  | 4,057 |  | 4,197
2021 | 9,158 |  | 9,158 |  | 9,479
pre-2021 | 3,886 |  | 3,886 |  | 4,159
Total loans | 22,400 |  | 22,400 |  | 21,751
Residential real estate | First Mortgages | Financial Asset Originated | Origination Loan to Value Ratio Greater Than 70% Through 90% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 822 |  | 822 |  |
2024 | 1,024 |  | 1,024 |  | 1,118
2023 | 645 |  | 645 |  | 703
2022 | 1,403 |  | 1,403 |  | 1,457
2021 | 1,384 |  | 1,384 |  | 1,438
pre-2021 | 863 |  | 863 |  | 920
Total loans | 6,141 |  | 6,141 |  | 5,636
Residential real estate | First Mortgages | Financial Asset Originated | Origination Loan to Value Ratio Greater Than 90% Through 100% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 0 |  | 0 |  |
2024 | 0 |  | 0 |  | 0
2023 | 0 |  | 0 |  | 0
2022 | 0 |  | 0 |  | 0
2021 | 0 |  | 0 |  | 0
pre-2021 | 1 |  | 1 |  | 2
Total loans | 1 |  | 1 |  | 2
Residential real estate | First Mortgages | Financial Asset Originated | Origination FICO Score Below 620 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 0 |  | 0 |  |
2024 | 1 |  | 1 |  | 1
2023 | 0 |  | 0 |  | 0
2022 | 3 |  | 3 |  | 2
2021 | 1 |  | 1 |  | 1
pre-2021 | 1 |  | 1 |  | 2
Total loans | 6 |  | 6 |  | 6
Residential real estate | First Mortgages | Financial Asset Originated | Origination FICO Score 620 Through 679 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 16 |  | 16 |  |
2024 | 23 |  | 23 |  | 24
2023 | 4 |  | 4 |  | 4
2022 | 25 |  | 25 |  | 26
2021 | 29 |  | 29 |  | 29
pre-2021 | 24 |  | 24 |  | 28
Total loans | 121 |  | 121 |  | 111
Residential real estate | First Mortgages | Financial Asset Originated | Origination FICO Score 680 Through 739 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 215 |  | 215 |  |
2024 | 332 |  | 332 |  | 361
2023 | 234 |  | 234 |  | 249
2022 | 695 |  | 695 |  | 724
2021 | 1,056 |  | 1,056 |  | 1,091
pre-2021 | 533 |  | 533 |  | 576
Total loans | 3,065 |  | 3,065 |  | 3,001
Residential real estate | First Mortgages | Financial Asset Originated | Origination FICO Score 740 and Above |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2025 | 2,305 |  | 2,305 |  |
2024 | 2,916 |  | 2,916 |  | 3,203
2023 | 1,744 |  | 1,744 |  | 1,895
2022 | 4,737 |  | 4,737 |  | 4,902
2021 | 9,456 |  | 9,456 |  | 9,796
pre-2021 | 4,192 |  | 4,192 |  | 4,475
Total loans | 25,350 |  | 25,350 |  | 24,271
Residential real estate | HELOCs |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 297 |  | 297 |  | 288
HELOCs converted to term loans | 126 |  | 126 |  | 136
Total loans | 423 |  | 423 |  | 424
Gross charge-offs |  |  |  |  |
Revolving HELOCs amortized cost basis |  |  | 0 |  | 0
HELOCs converted to term loans |  |  | 0 |  | 0
Total loans | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Percent of Loans on Nonaccrual Status |  |  |  |  |
Revolving HELOCs amortized cost basis | 0.11% |  | 0.11% |  | 0.07%
HELOCs converted to term loans | 1.72% |  | 1.72% |  | 2.33%
Total loans | 0.47% |  | 0.47% |  | 0.71%
Residential real estate | HELOCs | Estimated Current Loan To Value Ratio 70% and Below |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | $ 294 |  | $ 294 |  | $ 285
HELOCs converted to term loans | 126 |  | 126 |  | 136
Total loans | 420 |  | 420 |  | 421
Residential real estate | HELOCs | Estimated Current Loan To Value Ratio Greater Than 70% Through 90% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 3 |  | 3 |  | 3
HELOCs converted to term loans | 0 |  | 0 |  | 0
Total loans | 3 |  | 3 |  | 3
Residential real estate | HELOCs | Estimated Current LTV Greater Than 90% Through 100% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 0 |  | 0 |  | 0
HELOCs converted to term loans | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Residential real estate | HELOCs | Estimated Current LTV Greater Than 100% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis |  |  |  |  | 0
HELOCs converted to term loans |  |  |  |  | 0
Total loans |  |  |  |  | 0
Residential real estate | HELOCs | Updated FICO Score Below 620 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 2 |  | 2 |  | 1
HELOCs converted to term loans | 4 |  | 4 |  | 5
Total loans | 6 |  | 6 |  | 6
Residential real estate | HELOCs | Updated FICO Score 620 Through 679 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 6 |  | 6 |  | 6
HELOCs converted to term loans | 5 |  | 5 |  | 7
Total loans | 11 |  | 11 |  | 13
Residential real estate | HELOCs | Updated FICO Score 680 Through 739 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 49 |  | 49 |  | 48
HELOCs converted to term loans | 23 |  | 23 |  | 24
Total loans | 72 |  | 72 |  | 72
Residential real estate | HELOCs | Updated FICO Score 740 and Above |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 240 |  | 240 |  | 233
HELOCs converted to term loans | 94 |  | 94 |  | 100
Total loans | 334 |  | 334 |  | 333
Residential real estate | HELOCs | Financial Asset Originated |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 297 |  | 297 |  | 288
HELOCs converted to term loans | 126 |  | 126 |  | 136
Total loans | 423 |  | 423 |  | 424
Residential real estate | HELOCs | Financial Asset Originated | Origination Loan to Value Ratio 70% and Below |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 279 |  | 279 |  | 267
HELOCs converted to term loans | 88 |  | 88 |  | 95
Total loans | 367 |  | 367 |  | 362
Residential real estate | HELOCs | Financial Asset Originated | Origination Loan to Value Ratio Greater Than 70% Through 90% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 18 |  | 18 |  | 21
HELOCs converted to term loans | 37 |  | 37 |  | 40
Total loans | 55 |  | 55 |  | 61
Residential real estate | HELOCs | Financial Asset Originated | Origination Loan to Value Ratio Greater Than 90% Through 100% |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 0 |  | 0 |  | 0
HELOCs converted to term loans | 1 |  | 1 |  | 1
Total loans | 1 |  | 1 |  | 1
Residential real estate | HELOCs | Financial Asset Originated | Origination FICO Score Below 620 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 0 |  | 0 |  | 0
HELOCs converted to term loans | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Residential real estate | HELOCs | Financial Asset Originated | Origination FICO Score 620 Through 679 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 0 |  | 0 |  | 0
HELOCs converted to term loans | 1 |  | 1 |  | 1
Total loans | 1 |  | 1 |  | 1
Residential real estate | HELOCs | Financial Asset Originated | Origination FICO Score 680 Through 739 |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 49 |  | 49 |  | 47
HELOCs converted to term loans | 27 |  | 27 |  | 30
Total loans | 76 |  | 76 |  | 77
Residential real estate | HELOCs | Financial Asset Originated | Origination FICO Score 740 and Above |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Revolving HELOCs amortized cost basis | 248 |  | 248 |  | 241
HELOCs converted to term loans | 98 |  | 98 |  | 105
Total loans | $ 346 |  | $ 346 |  | $ 346

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