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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value    
Less than 12 months $ 4,616 $ 7,198
12 months or more 8,366 9,104
Total 12,982 16,302
Gross Unrealized Losses    
Less than 12 months (53) (178)
12 months or more (1,014) (1,231)
Total (1,067) (1,409)
U.S. Treasury and agency obligations    
Fair Value    
Less than 12 months 1,958 2,343
12 months or more 422 456
Total 2,380 2,799
Gross Unrealized Losses    
Less than 12 months (17) (68)
12 months or more (32) (42)
Total (49) (110)
Mortgage-backed securities    
Fair Value    
Less than 12 months 1,274 1,766
12 months or more 2,142 2,203
Total 3,416 3,969
Gross Unrealized Losses    
Less than 12 months (22) (50)
12 months or more (399) (459)
Total (421) (509)
Tax-exempt municipal securities    
Fair Value    
Less than 12 months 58 97
12 months or more 370 405
Total 428 502
Gross Unrealized Losses    
Less than 12 months (1) (1)
12 months or more (23) (21)
Total (24) (22)
Residential    
Fair Value    
Less than 12 months 46 130
12 months or more 331 343
Total 377 473
Gross Unrealized Losses    
Less than 12 months 0 (2)
12 months or more (54) (62)
Total (54) (64)
Commercial    
Fair Value    
Less than 12 months 95 58
12 months or more 874 992
Total 969 1,050
Gross Unrealized Losses    
Less than 12 months 0 (1)
12 months or more (61) (84)
Total (61) (85)
Asset-backed securities    
Fair Value    
Less than 12 months 181 419
12 months or more 329 436
Total 510 855
Gross Unrealized Losses    
Less than 12 months (3) (5)
12 months or more (13) (19)
Total (16) (24)
Corporate debt securities    
Fair Value    
Less than 12 months 1,004 2,385
12 months or more 3,898 4,269
Total 4,902 6,654
Gross Unrealized Losses    
Less than 12 months (10) (51)
12 months or more (432) (544)
Total $ (442) $ (595)