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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 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 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 4,098   4,098    
2024 3,106   3,106   $ 3,589
2023 1,901   1,901   2,148
2022 5,338   5,338   5,654
2021 10,335   10,335   10,917
pre-2021 4,583   4,583   5,081
Total loans 29,361   29,361   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 0.11%   0.11%   0.12%
2022 0.14%   0.14%   0.16%
2021 0.11%   0.11%   0.04%
pre-2021 0.24%   0.24%   0.18%
Total loans 0.11%   0.11%   0.09%
Residential real estate | First Mortgages | Estimated Current Loan To Value Ratio 70% and Below          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 $ 2,567   $ 2,567    
2024 2,205   2,205   $ 2,402
2023 1,552   1,552   1,660
2022 4,796   4,796   4,942
2021 10,225   10,225   10,747
pre-2021 4,570   4,570   5,057
Total loans 25,915   25,915   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 1,527   1,527    
2024 901   901   1,187
2023 345   345   487
2022 534   534   693
2021 109   109   166
pre-2021 13   13   20
Total loans 3,429   3,429   2,553
Residential real estate | First Mortgages | Estimated Current LTV Greater Than 90% Through 100%          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 4   4    
2024 0   0   0
2023 4   4   1
2022 8   8   17
2021 1   1   3
pre-2021 0   0   4
Total loans 17   17   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 3   3    
2024 4   4   0
2023 5   5   3
2022 26   26   25
2021 28   28   15
pre-2021 23   23   21
Total loans 89   89   64
Residential real estate | First Mortgages | Updated FICO Score 620 Through 679          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 36   36    
2024 34   34   34
2023 34   34   31
2022 64   64   74
2021 103   103   97
pre-2021 64   64   74
Total loans 335   335   310
Residential real estate | First Mortgages | Updated FICO Score 680 Through 739          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 355   355    
2024 248   248   339
2023 167   167   191
2022 491   491   574
2021 790   790   871
pre-2021 352   352   435
Total loans 2,403   2,403   2,410
Residential real estate | First Mortgages | Updated FICO Score 740 and Above          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 3,704   3,704    
2024 2,820   2,820   3,216
2023 1,695   1,695   1,923
2022 4,757   4,757   4,981
2021 9,414   9,414   9,934
pre-2021 4,144   4,144   4,551
Total loans 26,534   26,534   24,605
Residential real estate | First Mortgages | Financial Asset Originated          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 4,098   4,098    
2024 3,106   3,106   3,589
2023 1,901   1,901   2,148
2022 5,338   5,338   5,654
2021 10,335   10,335   10,917
pre-2021 4,583   4,583   5,081
Total loans 29,361   29,361   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 2,738   2,738    
2024 2,130   2,130   2,471
2023 1,286   1,286   1,445
2022 3,960   3,960   4,197
2021 8,990   8,990   9,479
pre-2021 3,753   3,753   4,159
Total loans 22,857   22,857   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 1,360   1,360    
2024 976   976   1,118
2023 615   615   703
2022 1,378   1,378   1,457
2021 1,345   1,345   1,438
pre-2021 829   829   920
Total loans 6,503   6,503   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 0   0   1
2023 0   0   0
2022 3   3   2
2021 1   1   1
pre-2021 1   1   2
Total loans 5   5   6
Residential real estate | First Mortgages | Financial Asset Originated | Origination FICO Score 620 Through 679          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 19   19    
2024 23   23   24
2023 4   4   4
2022 24   24   26
2021 28   28   29
pre-2021 22   22   28
Total loans 120   120   111
Residential real estate | First Mortgages | Financial Asset Originated | Origination FICO Score 680 Through 739          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 363   363    
2024 306   306   361
2023 230   230   249
2022 680   680   724
2021 1,032   1,032   1,091
pre-2021 513   513   576
Total loans 3,124   3,124   3,001
Residential real estate | First Mortgages | Financial Asset Originated | Origination FICO Score 740 and Above          
Financing Receivable, Credit Quality Indicator [Line Items]          
2025 3,716   3,716    
2024 2,777   2,777   3,203
2023 1,667   1,667   1,895
2022 4,631   4,631   4,902
2021 9,274   9,274   9,796
pre-2021 4,047   4,047   4,475
Total loans 26,112   26,112   24,271
Residential real estate | HELOCs          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving HELOCs amortized cost basis 301   301   288
HELOCs converted to term loans 120   120   136
Total loans 421   421   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 0.06%   0.06%   0.07%
HELOCs converted to term loans 2.01%   2.01%   2.33%
Total loans 0.71%   0.71%   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 $ 298   $ 298   $ 285
HELOCs converted to term loans 120   120   136
Total loans 418   418   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 3   3   1
HELOCs converted to term loans 4   4   5
Total loans 7   7   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 6   6   7
Total loans 12   12   13
Residential real estate | HELOCs | Updated FICO Score 680 Through 739          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving HELOCs amortized cost basis 41   41   48
HELOCs converted to term loans 20   20   24
Total loans 61   61   72
Residential real estate | HELOCs | Updated FICO Score 740 and Above          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving HELOCs amortized cost basis 251   251   233
HELOCs converted to term loans 90   90   100
Total loans 341   341   333
Residential real estate | HELOCs | Financial Asset Originated          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving HELOCs amortized cost basis 301   301   288
HELOCs converted to term loans 120   120   136
Total loans 421   421   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 284   284   267
HELOCs converted to term loans 84   84   95
Total loans 368   368   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 17   17   21
HELOCs converted to term loans 35   35   40
Total loans 52   52   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 50   50   47
HELOCs converted to term loans 25   25   30
Total loans 75   75   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 251   251   241
HELOCs converted to term loans 94   94   105
Total loans $ 345   $ 345   $ 346