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INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Gross unrealized gains $ 1,044 $ 641
Gross unrealized losses (2,539) (3,148)
Equity 254 225
Non-current investment securities, amortized cost 39,652 40,248
Non-current investment securities, estimated fair value 38,158 37,741
U.S. corporate    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 27,489 28,456
Gross unrealized gains 869 546
Gross unrealized losses (1,883) (2,309)
Estimated fair value 26,475 26,692
Non-U.S. corporate    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 2,871 2,970
Gross unrealized gains 46 23
Gross unrealized losses (233) (302)
Estimated fair value 2,684 2,691
State and municipal    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 2,666 2,409
Gross unrealized gains 55 22
Gross unrealized losses (190) (235)
Estimated fair value 2,531 2,196
Mortgage and asset-backed    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 5,324 5,007
Gross unrealized gains 70 47
Gross unrealized losses (131) (183)
Estimated fair value 5,262 4,870
Government and agencies    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, excluding accrued interest 1,048 1,180
Gross unrealized gains 5 4
Gross unrealized losses (103) (118)
Estimated fair value $ 951 $ 1,066