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INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]    
Gross unrealized gains $ 730 $ 985
Gross unrealized losses (2,766) (2,619)
Equity 562 887
Non-current investment securities, amortized cost 39,946 40,422
Non-current investment securities, estimated fair value 37,910 38,788
U.S. corporate    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 27,791 27,658
Gross unrealized gains 621 825
Gross unrealized losses (2,094) (1,969)
Estimated fair value 26,318 26,513
Non-U.S. corporate    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 2,966 2,909
Gross unrealized gains 19 41
Gross unrealized losses (252) (242)
Estimated fair value 2,732 2,707
State and municipal    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 2,623 2,751
Gross unrealized gains 36 46
Gross unrealized losses (193) (192)
Estimated fair value 2,466 2,605
Mortgage and asset-backed    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 5,314 5,202
Gross unrealized gains 53 69
Gross unrealized losses (129) (121)
Estimated fair value 5,238 5,151
Government and agencies    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 690 1,015
Gross unrealized gains 1 4
Gross unrealized losses (98) (95)
Estimated fair value $ 594 $ 924