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Loans - Summary of Concentration of Secured and Unsecured Loans (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 226,887	$ 200,866
Loans at fair value	5,498	5,460
Loans held for sale	$ 2,502	$ 3,525
Concentration risk percentage	100	100
Corporate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 31,804	$ 29,972
Loans at fair value	$ 430	$ 467
Concentration risk percentage	100	100
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 33,952	$ 29,789
Loans at fair value	$ 423	$ 424
Concentration risk percentage	100	100
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 30,147	$ 25,969
Loans at fair value	$ 3,445	$ 3,726
Concentration risk percentage	100	100
Loan-to-value ratio	80.00%	80.00%
Residential real estate | FICO Credit Score Greater Than 740
Financing Receivable, Recorded Investment [Line Items]
Credit score	740	740
Securities-based
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 18,469	$ 16,477
Concentration risk percentage	100	100
Loan-to-value ratio	80.00%	80.00%
Other collateralized
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 89,764	$ 75,107
Loans at fair value	$ 1,149	$ 783
Concentration risk percentage	100	100
Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 20,017	$ 21,403
Concentration risk percentage	100	100
Other
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 2,734	$ 2,149
Loans at fair value	$ 51	$ 60
Concentration risk percentage	100	100
Secured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	85	83
Unsecured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	15	17
Amortized Cost
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 218,887	$ 191,881
Amortized Cost | Corporate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	30,139	28,689
Amortized Cost | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	32,805	28,899
Amortized Cost | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	26,702	22,243
Amortized Cost | Securities-based
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	18,469	16,477
Amortized Cost | Other collateralized
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	88,141	74,008
Amortized Cost | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	20,017	19,615
Amortized Cost | Other
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	2,614	1,950
Fair Value
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	5,498	5,460
Fair Value | Corporate
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	430	467
Fair Value | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	423	424
Fair Value | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	3,445	3,726
Fair Value | Securities-based
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	0	0
Fair Value | Other collateralized
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	1,149	783
Fair Value | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	0	0
Fair Value | Other
Financing Receivable, Recorded Investment [Line Items]
Loans at fair value	51	60
Held For Sale
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	2,502	3,525
Held For Sale | Corporate
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	1,235	816
Held For Sale | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	724	466
Held For Sale | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	0	0
Held For Sale | Securities-based
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	0	0
Held For Sale | Other collateralized
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	474	316
Held For Sale | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	0	1,788
Held For Sale | Other
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	69	139
Investment-Grade
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	134,840	115,360
Loans at fair value	722	505
Loans held for sale	$ 930	$ 869
Concentration risk percentage	100	100
Investment-Grade | Corporate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 9,155	$ 8,601
Investment-Grade | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	21,974	18,175
Investment-Grade | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	14,071	10,227
Investment-Grade | Securities-based
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	13,884	12,662
Investment-Grade | Other collateralized
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	73,321	63,896
Investment-Grade | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	0	0
Investment-Grade | Other
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 2,435	$ 1,799
Investment-Grade | Secured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	94	93
Investment-Grade | Unsecured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	6	7
Investment-Grade | Amortized Cost
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 133,188	$ 113,986
Non-Investment- Grade
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	53,712	47,196
Loans at fair value	1,448	856
Loans held for sale	$ 1,529	$ 745
Concentration risk percentage	100	100
Non-Investment- Grade | Corporate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 22,649	$ 21,370
Non-Investment- Grade | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	11,978	11,514
Non-Investment- Grade | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	3,028	3,375
Non-Investment- Grade | Securities-based
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	418	320
Non-Investment- Grade | Other collateralized
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	15,421	10,442
Non-Investment- Grade | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	0	0
Non-Investment- Grade | Other
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 218	$ 175
Non-Investment- Grade | Secured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	91	90
Non-Investment- Grade | Unsecured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	9	10
Non-Investment- Grade | Amortized Cost
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 50,735	$ 45,595
Other Metrics/Unrated
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	38,335	38,310
Loans at fair value	3,328	4,099
Loans held for sale	$ 43	$ 1,911
Concentration risk percentage	100	100
Other Metrics/Unrated | Corporate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 0	$ 1
Other Metrics/Unrated | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	0	100
Other Metrics/Unrated | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	13,048	12,367
Other Metrics/Unrated | Securities-based
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	4,167	3,495
Other Metrics/Unrated | Other collateralized
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	1,022	769
Other Metrics/Unrated | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	20,017	21,403
Other Metrics/Unrated | Other
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 81	$ 175
Other Metrics/Unrated | Secured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	47	43
Other Metrics/Unrated | Unsecured
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	53	57
Other Metrics/Unrated | Amortized Cost
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 34,964	$ 32,300

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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