Bank Loans and Related Allowance for Credit Losses - Credit Quality Indicators of Bank Loan Portfolio (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 57,991	$ 45,236
Gross charge-offs
Total loans	0	0	$ 0
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	30,911	27,813
Gross charge-offs
Total loans	0	0	0
First Mortgages \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	6,029
2024	2,823	3,589
2023	1,796	2,148
2022	5,239	5,654
2021	10,149	10,917
pre-2021	4,448	5,081
Total loans	30,484	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
Percent of Loans on Nonaccrual Status
2025	0.01%
2024	0.01%	0.01%
2023	0.11%	0.12%
2022	0.10%	0.16%
2021	0.15%	0.04%
pre-2021	0.31%	0.18%
Total loans	0.12%	0.09%
First Mortgages \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 6,029
2024	2,823	$ 3,589
2023	1,796	2,148
2022	5,239	5,654
2021	10,149	10,917
pre-2021	4,448	5,081
Total loans	30,484	27,389
First Mortgages \| Origination Loan To Value Ratio 70% and Below \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	4,105
2024	1,925	2,471
2023	1,216	1,445
2022	3,891	4,197
2021	8,832	9,479
pre-2021	3,641	4,159
Total loans	23,610	21,751
First Mortgages \| Origination Loan to Value Ratio Greater Than 70% Through 90% \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	1,924
2024	898	1,118
2023	580	703
2022	1,348	1,457
2021	1,317	1,438
pre-2021	806	920
Total loans	6,873	5,636
First Mortgages \| Origination Loan to Value Ratio Greater Than 90% Through 100% \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
pre-2021	1	2
Total loans	1	2
First Mortgages \| Estimated Current LTV 70% and Below \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	3,877
2024	1,989	2,402
2023	1,450	1,660
2022	4,696	4,942
2021	10,046	10,747
pre-2021	4,437	5,057
Total loans	26,495	24,808
First Mortgages \| Estimated Current LTV Greater Than 70% through 90% \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	2,148
2024	829	1,187
2023	342	487
2022	537	693
2021	103	166
pre-2021	11	20
Total loans	3,970	2,553
First Mortgages \| Estimated Current LTV Greater Than 90% through 100% \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	4
2024	5	0
2023	4	1
2022	6	17
2021	0	3
pre-2021	0	4
Total loans	19	25
First Mortgages \| Estimated Current LTV Greater Than 100% \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		2
2021		1
pre-2021		0
Total loans		3
First Mortgages \| Origination FICO Score Below 620 \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0
2024	1	1
2023	0	0
2022	3	2
2021	1	1
pre-2021	1	2
Total loans	6	6
First Mortgages \| Origination FICO Score 620 Through 679 \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	23
2024	16	24
2023	4	4
2022	23	26
2021	28	29
pre-2021	21	28
Total loans	115	111
First Mortgages \| Origination FICO Score 680 Through 739 \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	526
2024	272	361
2023	219	249
2022	667	724
2021	1,011	1,091
pre-2021	497	576
Total loans	3,192	3,001
First Mortgages \| Origination FICO Score 740 and Above \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	5,480
2024	2,534	3,203
2023	1,573	1,895
2022	4,546	4,902
2021	9,109	9,796
pre-2021	3,929	4,475
Total loans	27,171	24,271
First Mortgages \| Updated FICO Score Below 620 \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	8
2024	4	0
2023	3	3
2022	36	25
2021	32	15
pre-2021	23	21
Total loans	106	64
First Mortgages \| Updated FICO Score 620 Through 679 \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	59
2024	31	34
2023	25	31
2022	61	74
2021	80	97
pre-2021	60	74
Total loans	316	310
First Mortgages \| Updated FICO Score 680 Through 739 \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	570
2024	227	339
2023	153	191
2022	483	574
2021	797	871
pre-2021	360	435
Total loans	2,590	2,410
First Mortgages \| Updated FICO Score 740 And Above \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2025	5,392
2024	2,561	3,216
2023	1,615	1,923
2022	4,659	4,981
2021	9,240	9,934
pre-2021	4,005	4,551
Total loans	27,472	24,605
HELOCs \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	427	424
Revolving HELOCs amortized cost basis	312	288
HELOCs converted to term loans	115	136
Gross charge-offs
Total loans	0	0	$ 0
Revolving HELOCs amortized cost basis	0	0
HELOCs converted to term loans	$ 0	$ 0
Percent of Loans on Nonaccrual Status
Total loans	0.70%	0.71%
Revolving HELOCs amortized cost basis	0.16%	0.07%
HELOCs converted to term loans	1.80%	2.33%
HELOCs \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 427	$ 424
Revolving HELOCs amortized cost basis	312	288
HELOCs converted to term loans	115	136
HELOCs \| Origination Loan To Value Ratio 70% and Below \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	376	362
Revolving HELOCs amortized cost basis	296	267
HELOCs converted to term loans	80	95
HELOCs \| Origination Loan to Value Ratio Greater Than 70% Through 90% \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	50	61
Revolving HELOCs amortized cost basis	16	21
HELOCs converted to term loans	34	40
HELOCs \| Origination Loan to Value Ratio Greater Than 90% Through 100% \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1	1
Revolving HELOCs amortized cost basis	0	0
HELOCs converted to term loans	1	1
HELOCs \| Estimated Current LTV 70% and Below \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	425	421
Revolving HELOCs amortized cost basis	310	285
HELOCs converted to term loans	115	136
HELOCs \| Estimated Current LTV Greater Than 70% through 90% \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2	3
Revolving HELOCs amortized cost basis	2	3
HELOCs converted to term loans	0	0
HELOCs \| Estimated Current LTV Greater Than 90% through 100% \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Revolving HELOCs amortized cost basis	0	0
HELOCs converted to term loans	0	0
HELOCs \| Estimated Current LTV Greater Than 100% \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Revolving HELOCs amortized cost basis		0
HELOCs converted to term loans		0
HELOCs \| Origination FICO Score Below 620 \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Revolving HELOCs amortized cost basis	0	0
HELOCs converted to term loans	0	0
HELOCs \| Origination FICO Score 620 Through 679 \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1	1
Revolving HELOCs amortized cost basis	0	0
HELOCs converted to term loans	1	1
HELOCs \| Origination FICO Score 680 Through 739 \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	76	77
Revolving HELOCs amortized cost basis	52	47
HELOCs converted to term loans	24	30
HELOCs \| Origination FICO Score 740 and Above \| Financial Asset Originated \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	350	346
Revolving HELOCs amortized cost basis	260	241
HELOCs converted to term loans	90	105
HELOCs \| Updated FICO Score Below 620 \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6	6
Revolving HELOCs amortized cost basis	3	1
HELOCs converted to term loans	3	5
HELOCs \| Updated FICO Score 620 Through 679 \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11	13
Revolving HELOCs amortized cost basis	5	6
HELOCs converted to term loans	6	7
HELOCs \| Updated FICO Score 680 Through 739 \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	68	72
Revolving HELOCs amortized cost basis	48	48
HELOCs converted to term loans	20	24
HELOCs \| Updated FICO Score 740 And Above \| Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	342	333
Revolving HELOCs amortized cost basis	256	233
HELOCs converted to term loans	$ 86	$ 100

Financing Receivable, Ratio Of Nonperforming Loans To All Loans [Abstract]

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Financing Receivable, Ratio of Nonperforming Loans to All Loans, Excluding Accrued Interest

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Excluding Accrued Interest, Originated, More Than Five Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Excluding Accrued Interest, Revolving

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Excluding Accrued Interest, Year Five, Originated, Four Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Excluding Accrued Interest, Year Four, Originated, Three Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Excluding Accrued Interest, Year Three, Originated, Two Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Excluding Accrued Interest, Year Two, Originated, Fiscal Year Before Current Fiscal Year

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Financing Receivable, Ratio Of Nonperforming Loans To All Loans, Revolving, Excluding Accrued Interest, Converted To Term Loan

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn.

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Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease.

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