Bank Loans and Related Allowance for Credit Losses - Credit Quality Indicators of Bank Loan Portfolio (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Gross charge-offs
Total loans	$ 0	$ 0
Residential real estate
Gross charge-offs
Total loans	0	0
Residential real estate \| First Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2026	1,889
2025	5,714		$ 6,029
2024	2,555		2,823
2023	1,684		1,796
2022	5,149		5,239
pre-2022	14,278		14,597
Total loans	31,269		30,484
Gross charge-offs
2026	0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
pre-2022	0		0
Total loans	$ 0	0	$ 0
Percent of Loans on Nonaccrual Status
2026	0.01%
2025	0.01%		0.01%
2024	0.01%		0.01%
2023	0.01%		0.11%
2022	0.05%		0.10%
pre-2022	0.12%		0.20%
Total loans	0.07%		0.12%
Residential real estate \| First Mortgages \| Estimated Refrsehed Loan To Value Ratio 70% and Below
Financing Receivable, Credit Quality Indicator [Line Items]
2026	$ 1,376
2025	3,740		$ 3,877
2024	1,826		1,989
2023	1,390		1,450
2022	4,637		4,696
pre-2022	14,167		14,483
Total loans	27,136		26,495
Residential real estate \| First Mortgages \| Estimated Refreshed Loan To Value Ratio Greater Than 70% Through 90%
Financing Receivable, Credit Quality Indicator [Line Items]
2026	513
2025	1,968		2,148
2024	727		829
2023	291		342
2022	508		537
pre-2022	109		114
Total loans	4,116		3,970
Residential real estate \| First Mortgages \| Estimated Refreshed LTV Greater Than 90% Through 100%
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0
2025	6		4
2024	2		5
2023	3		4
2022	4		6
pre-2022	2		0
Total loans	17		19
Residential real estate \| First Mortgages \| Updated FICO Score Below 620
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0
2025	7		8
2024	7		4
2023	5		3
2022	21		36
pre-2022	42		55
Total loans	82		106
Residential real estate \| First Mortgages \| Updated FICO Score 620 Through 679
Financing Receivable, Credit Quality Indicator [Line Items]
2026	18
2025	44		59
2024	19		31
2023	24		25
2022	62		61
pre-2022	154		140
Total loans	321		316
Residential real estate \| First Mortgages \| Updated FICO Score 680 Through 739
Financing Receivable, Credit Quality Indicator [Line Items]
2026	168
2025	478		570
2024	220		227
2023	141		153
2022	462		483
pre-2022	1,102		1,157
Total loans	2,571		2,590
Residential real estate \| First Mortgages \| Updated FICO Score 740 and Above
Financing Receivable, Credit Quality Indicator [Line Items]
2026	1,703
2025	5,185		5,392
2024	2,309		2,561
2023	1,514		1,615
2022	4,604		4,659
pre-2022	12,980		13,245
Total loans	28,295		27,472
Residential real estate \| First Mortgages \| Financial Asset Originated
Financing Receivable, Credit Quality Indicator [Line Items]
2026	1,889
2025	5,714		6,029
2024	2,555		2,823
2023	1,684		1,796
2022	5,149		5,239
pre-2022	14,278		14,597
Total loans	31,269		30,484
Residential real estate \| First Mortgages \| Financial Asset Originated \| Origination Loan to Value Ratio 70% and Below
Financing Receivable, Credit Quality Indicator [Line Items]
2026	1,388
2025	3,877		4,105
2024	1,731		1,925
2023	1,140		1,216
2022	3,827		3,891
pre-2022	12,205		12,473
Total loans	24,168		23,610
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]
2026	501
2025	1,837		1,924
2024	824		898
2023	544		580
2022	1,322		1,348
pre-2022	2,072		2,123
Total loans	7,100		6,873
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]
2026	0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
pre-2022	1		1
Total loans	1		1
Residential real estate \| First Mortgages \| Financial Asset Originated \| Origination FICO Score Below 620
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0
2025	0		0
2024	1		1
2023	0		0
2022	2		3
pre-2022	2		2
Total loans	5		6
Residential real estate \| First Mortgages \| Financial Asset Originated \| Origination FICO Score 620 Through 679
Financing Receivable, Credit Quality Indicator [Line Items]
2026	15
2025	19		23
2024	15		16
2023	4		4
2022	23		23
pre-2022	48		49
Total loans	124		115
Residential real estate \| First Mortgages \| Financial Asset Originated \| Origination FICO Score 680 Through 739
Financing Receivable, Credit Quality Indicator [Line Items]
2026	144
2025	516		526
2024	247		272
2023	207		219
2022	656		667
pre-2022	1,471		1,508
Total loans	3,241		3,192
Residential real estate \| First Mortgages \| Financial Asset Originated \| Origination FICO Score 740 and Above
Financing Receivable, Credit Quality Indicator [Line Items]
2026	1,730
2025	5,179		5,480
2024	2,292		2,534
2023	1,473		1,573
2022	4,468		4,546
pre-2022	12,757		13,038
Total loans	27,899		27,171
Residential real estate \| HELOCs
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	312		312
HELOCs converted to term loans	110		115
Total loans	422		427
Gross charge-offs
Revolving HELOCs amortized cost basis	0		0
HELOCs converted to term loans	0		0
Total loans	$ 0	$ 0	$ 0
Percent of Loans on Nonaccrual Status
Revolving HELOCs amortized cost basis	0.11%		0.16%
HELOCs converted to term loans	2.18%		1.80%
Total loans	0.71%		0.70%
Residential real estate \| HELOCs \| Estimated Refrsehed Loan To Value Ratio 70% and Below
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	$ 310		$ 310
HELOCs converted to term loans	110		115
Total loans	420		425
Residential real estate \| HELOCs \| Estimated Refreshed Loan To Value Ratio Greater Than 70% Through 90%
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	2		2
HELOCs converted to term loans	0		0
Total loans	2		2
Residential real estate \| HELOCs \| Estimated Refreshed LTV Greater Than 90% Through 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	0		0
HELOCs converted to term loans	0		0
Total loans	0		0
Residential real estate \| HELOCs \| Updated FICO Score Below 620
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	3		3
HELOCs converted to term loans	4		3
Total loans	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		5
HELOCs converted to term loans	6		6
Total loans	12		11
Residential real estate \| HELOCs \| Updated FICO Score 680 Through 739
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	42		48
HELOCs converted to term loans	17		20
Total loans	59		68
Residential real estate \| HELOCs \| Updated FICO Score 740 and Above
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	261		256
HELOCs converted to term loans	83		86
Total loans	344		342
Residential real estate \| HELOCs \| Financial Asset Originated
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving HELOCs amortized cost basis	312		312
HELOCs converted to term loans	110		115
Total loans	422		427
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	297		296
HELOCs converted to term loans	78		80
Total loans	375		376
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	15		16
HELOCs converted to term loans	32		34
Total loans	47		50
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
HELOCs converted to term loans	0		1
Total loans	0		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
HELOCs converted to term loans	0		0
Total loans	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
HELOCs converted to term loans	1		1
Total loans	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	53		52
HELOCs converted to term loans	23		24
Total loans	76		76
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	259		260
HELOCs converted to term loans	86		90
Total loans	$ 345		$ 350

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 revolving financing receivable converted to term loan.

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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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Amount, excluding accrued interest, of writeoff of financing receivable originated four years before 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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