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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