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Derivatives and Hedging Activities - Credit Derivatives (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor $ 937,664 $ 601,494
Maximum Payout/Notional Amount of Purchased Credit Derivatives 1,018,520 678,077
Offsetting    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 767,434 497,655
Other    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 251,086 180,422
Less than 1 Year    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 224,963 164,778
1 - 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 575,477 404,528
Greater than 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 137,224 32,188
Written Credit Derivative    
Derivative [Line Items]    
Fair Value Asset of Written Credit Derivatives 10,317 7,183
Fair Value Liability of Written Credit Derivatives 2,801 2,744
Fair Value Net Asset/(Liability) of Written Credit Derivatives 7,516 4,439
0 - 250    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 875,072 545,084
Maximum Payout/Notional Amount of Purchased Credit Derivatives 953,481 629,581
0 - 250 | Offsetting    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 725,891 463,919
0 - 250 | Other    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 227,590 165,662
0 - 250 | Less than 1 Year    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 208,030 137,145
0 - 250 | 1 - 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 539,744 378,743
0 - 250 | Greater than 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 127,298 29,196
0 - 250 | Written Credit Derivative    
Derivative [Line Items]    
Fair Value Asset of Written Credit Derivatives 8,694 6,429
Fair Value Liability of Written Credit Derivatives 893 985
Fair Value Net Asset/(Liability) of Written Credit Derivatives 7,801 5,444
251 - 500    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 43,168 41,681
Maximum Payout/Notional Amount of Purchased Credit Derivatives 43,803 32,412
251 - 500 | Offsetting    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 23,493 20,691
251 - 500 | Other    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 20,310 11,721
251 - 500 | Less than 1 Year    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 13,672 23,875
251 - 500 | 1 - 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 22,374 15,349
251 - 500 | Greater than 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 7,122 2,457
251 - 500 | Written Credit Derivative    
Derivative [Line Items]    
Fair Value Asset of Written Credit Derivatives 1,291 664
Fair Value Liability of Written Credit Derivatives 601 314
Fair Value Net Asset/(Liability) of Written Credit Derivatives 690 350
501 - 1,000    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 9,672 5,430
Maximum Payout/Notional Amount of Purchased Credit Derivatives 10,928 6,660
501 - 1,000 | Offsetting    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 9,046 4,781
501 - 1,000 | Other    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 1,882 1,879
501 - 1,000 | Less than 1 Year    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 527 717
501 - 1,000 | 1 - 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 7,174 4,242
501 - 1,000 | Greater than 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 1,971 471
501 - 1,000 | Written Credit Derivative    
Derivative [Line Items]    
Fair Value Asset of Written Credit Derivatives 276 31
Fair Value Liability of Written Credit Derivatives 359 307
Fair Value Net Asset/(Liability) of Written Credit Derivatives (83) (276)
Greater than 1,000    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 9,752 9,299
Maximum Payout/Notional Amount of Purchased Credit Derivatives 10,308 9,424
Greater than 1,000 | Offsetting    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 9,004 8,264
Greater than 1,000 | Other    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Purchased Credit Derivatives 1,304 1,160
Greater than 1,000 | Less than 1 Year    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 2,734 3,041
Greater than 1,000 | 1 - 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 6,185 6,194
Greater than 1,000 | Greater than 5 Years    
Derivative [Line Items]    
Maximum Payout/Notional Amount of Written Credit Derivatives by Tenor 833 64
Greater than 1,000 | Written Credit Derivative    
Derivative [Line Items]    
Fair Value Asset of Written Credit Derivatives 56 59
Fair Value Liability of Written Credit Derivatives 948 1,138
Fair Value Net Asset/(Liability) of Written Credit Derivatives $ (892) $ (1,079)