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Loans - Schedule of Credit Quality Indicators for Term Loans by Origination Year (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]    
Total $ 226,887 $ 200,866
Percentage of total 100.00% 100.00%
All Classes except Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 198,870 $ 172,266
Corporate    
Financing Receivable, Recorded Investment [Line Items]    
Total 31,804 29,972
Investment-Grade    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 134,840 $ 115,360
Percentage of total 67.00% 66.00%
Investment-Grade | All Classes except Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 133,188 $ 113,986
Investment-Grade | Corporate    
Financing Receivable, Recorded Investment [Line Items]    
Total 9,155 8,601
Non-Investment- Grade    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 53,712 $ 47,196
Percentage of total 26.00% 27.00%
Non-Investment- Grade | All Classes except Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 50,735 $ 45,595
Non-Investment- Grade | Corporate    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 22,649 $ 21,370
Other Metrics/ Unrated    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total 7.00% 7.00%
Other Metrics/ Unrated | All Classes except Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 14,947 $ 12,685
Corporate    
Financing Receivable, Recorded Investment [Line Items]    
Year one 4,112 3,992
Year two 2,960 2,968
Year three 1,476 2,812
Year four 2,217 2,459
Year five 1,961 1,389
More than five years 2,483 2,286
Revolving 14,844 12,697
Revolving converted to term 86 86
Total 30,139 28,689
Corporate | Investment-Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 985 1,447
Year two 1,236 1,522
Year three 560 727
Year four 1,031 215
Year five 131 102
More than five years 520 376
Revolving 4,354 4,001
Revolving converted to term 0 0
Total 8,817 8,390
Corporate | Non-Investment- Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 3,127 2,545
Year two 1,724 1,446
Year three 916 2,084
Year four 1,186 2,244
Year five 1,830 1,287
More than five years 1,963 1,910
Revolving 10,490 8,696
Revolving converted to term 86 86
Total 21,322 20,298
Corporate | Other Metrics/ Unrated    
Financing Receivable, Recorded Investment [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 1
Year four 0 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving converted to term 0 0
Total 0 1
Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Year one 4,328 4,684
Year two 4,695 2,331
Year three 1,903 2,682
Year four 2,173 2,525
Year five 2,146 1,039
More than five years 2,188 1,728
Revolving 15,035 13,304
Revolving converted to term 337 606
Total 32,805 28,899
Commercial real estate | Investment-Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 2,335 2,988
Year two 3,223 1,079
Year three 1,003 1,018
Year four 799 624
Year five 405 273
More than five years 864 972
Revolving 12,509 10,355
Revolving converted to term 201 201
Total 21,339 17,510
Commercial real estate | Non-Investment- Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 1,993 1,669
Year two 1,472 1,252
Year three 900 1,664
Year four 1,374 1,901
Year five 1,741 766
More than five years 1,324 738
Revolving 2,526 2,944
Revolving converted to term 136 405
Total 11,466 11,339
Commercial real estate | Other Metrics/ Unrated    
Financing Receivable, Recorded Investment [Line Items]    
Year one 0 27
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 0 18
Revolving 0 5
Revolving converted to term 0 0
Total 0 50
Residential real estate    
Financing Receivable, Recorded Investment [Line Items]    
Year one 2,969 3,043
Year two 2,451 1,647
Year three 1,471 2,670
Year four 2,539 2,741
Year five 2,602 47
More than five years 334 325
Revolving 14,336 11,770
Total 26,702 22,243
Residential real estate | Investment-Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 900 713
Year two 883 224
Year three 102 87
Year four 86 21
Year five 19 0
More than five years 0 0
Revolving 11,920 9,182
Total 13,910 10,227
Residential real estate | Non-Investment- Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 303 584
Year two 42 9
Year three 99 46
Year four 42 122
Year five 107 6
More than five years 19 19
Revolving 2,416 2,588
Total 3,028 3,374
Residential real estate | Other Metrics/ Unrated    
Financing Receivable, Recorded Investment [Line Items]    
Year one 1,766 1,746
Year two 1,526 1,414
Year three 1,270 2,537
Year four 2,411 2,598
Year five 2,476 41
More than five years 315 306
Revolving 0 0
Total 9,764 8,642
Securities-based    
Financing Receivable, Recorded Investment [Line Items]    
Year one 5 1,622
Year two 2,003 35
Year three 38 5
Year five 5  
More than five years   22
Revolving 16,418 14,793
Total 18,469 16,477
Securities-based | Investment-Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 5 1,528
Year two 1,964 35
Year three 38 5
Year five 5  
More than five years   0
Revolving 11,872 11,094
Total 13,884 12,662
Securities-based | Non-Investment- Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 0 78
Year two 39 0
Year three 0 0
Year five 0  
More than five years   22
Revolving 379 220
Total 418 320
Securities-based | Other Metrics/ Unrated    
Financing Receivable, Recorded Investment [Line Items]    
Year one 0 16
Year two 0 0
Year three 0 0
Year five 0  
More than five years   0
Revolving 4,167 3,479
Total 4,167 3,495
Other collateralized    
Financing Receivable, Recorded Investment [Line Items]    
Year one 8,255 7,193
Year two 6,913 5,245
Year three 3,985 1,096
Year four 1,036 1,357
Year five 1,186 1,446
More than five years 746 266
Revolving 65,437 56,599
Revolving converted to term 583 806
Total 88,141 74,008
Other collateralized | Investment-Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 4,966 5,033
Year two 4,231 3,816
Year three 3,065 910
Year four 885 546
Year five 441 854
More than five years 636 196
Revolving 58,035 51,373
Revolving converted to term 581 710
Total 72,840 63,438
Other collateralized | Non-Investment- Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 3,165 2,009
Year two 2,596 1,279
Year three 819 144
Year four 122 739
Year five 692 566
More than five years 64 45
Revolving 6,825 5,211
Revolving converted to term 2 96
Total 14,285 10,089
Other collateralized | Other Metrics/ Unrated    
Financing Receivable, Recorded Investment [Line Items]    
Year one 124 151
Year two 86 150
Year three 101 42
Year four 29 72
Year five 53 26
More than five years 46 25
Revolving 577 15
Revolving converted to term 0 0
Total 1,016 481
Other    
Financing Receivable, Recorded Investment [Line Items]    
Year one 607 330
Year two 287 123
Year three 94 42
Year four 31 32
Year five 17 2
More than five years 3  
Revolving 1,575 1,421
Total 2,614 1,950
Other | Investment-Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 564 257
Year two 256 113
Year three 81 36
Year four 30 16
Year five 17 0
More than five years 0  
Revolving 1,450 1,337
Total 2,398 1,759
Other | Non-Investment- Grade    
Financing Receivable, Recorded Investment [Line Items]    
Year one 43 73
Year two 31 10
Year three 13 6
Year four 1 0
Year five 0 2
More than five years 3  
Revolving 125 84
Total 216 175
Other | Other Metrics/ Unrated    
Financing Receivable, Recorded Investment [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 0 16
Year five 0 0
More than five years 0  
Revolving 0 0
Total $ 0 $ 16