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Securities - Fair Value of Investments with Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 16,462 $ 24,128
Less than 12 months, Unrealized losses 71 341
12 months or more, Fair value 27,425 35,333
12 months or more, Unrealized losses 937 1,490
Total, Fair value 43,887 59,461
Total, Unrealized losses 1,008 1,831
U.S. Treasury    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 3,900 4,154
Less than 12 months, Unrealized losses 8 15
12 months or more, Fair value 7,077 8,334
12 months or more, Unrealized losses 67 166
Total, Fair value 10,977 12,488
Total, Unrealized losses 75 181
Non-U.S. government    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 6,605 7,283
Less than 12 months, Unrealized losses 24 59
12 months or more, Fair value 4,355 7,305
12 months or more, Unrealized losses 169 297
Total, Fair value 10,960 14,588
Total, Unrealized losses 193 356
Agency residential mortgage-backed securities (“RMBS”)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 3,375 10,469
Less than 12 months, Unrealized losses 32 249
12 months or more, Fair value 6,240 7,003
12 months or more, Unrealized losses 252 326
Total, Fair value 9,615 17,472
Total, Unrealized losses 284 575
Agency commercial mortgage-backed securities (“MBS”)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 243 554
Less than 12 months, Unrealized losses 1 5
12 months or more, Fair value 4,837 5,841
12 months or more, Unrealized losses 144 242
Total, Fair value 5,080 6,395
Total, Unrealized losses 145 247
Foreign covered bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 768 892
Less than 12 months, Unrealized losses 2 2
12 months or more, Fair value 1,486 2,287
12 months or more, Unrealized losses 57 92
Total, Fair value 2,254 3,179
Total, Unrealized losses 59 94
Non-agency commercial MBS    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 40 58
Less than 12 months, Unrealized losses 0 0
12 months or more, Fair value 1,950 2,127
12 months or more, Unrealized losses 96 156
Total, Fair value 1,990 2,185
Total, Unrealized losses 96 156
Collateralized loan obligations (“CLOs”)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 1,316  
Less than 12 months, Unrealized losses 2  
12 months or more, Fair value 0  
12 months or more, Unrealized losses 0  
Total, Fair value 1,316  
Total, Unrealized losses 2  
Non-agency RMBS    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 185 139
Less than 12 months, Unrealized losses 2 2
12 months or more, Fair value 837 995
12 months or more, Unrealized losses 126 161
Total, Fair value 1,022 1,134
Total, Unrealized losses 128 163
U.S. government agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 19 576
Less than 12 months, Unrealized losses 0 9
12 months or more, Fair value 323 905
12 months or more, Unrealized losses 1 10
Total, Fair value 342 1,481
Total, Unrealized losses 1 19
Other asset-backed securities (“ABS”)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value 11 3
Less than 12 months, Unrealized losses 0 0
12 months or more, Fair value 320 536
12 months or more, Unrealized losses 25 40
Total, Fair value 331 539
Total, Unrealized losses $ 25 $ 40