INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]
Gross unrealized gains	$ 190	$ 985
Gross unrealized losses	(4,619)	(2,619)
Equity	657	887
Non-current investment securities, amortized cost	40,378	40,422
Non-current investment securities, estimated fair value	35,949	38,788
U.S. corporate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	27,872	27,658
Gross unrealized gains	142	825
Gross unrealized losses	(3,541)	(1,969)
Estimated fair value	24,473	26,513
Non-U.S. corporate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	2,965	2,909
Gross unrealized gains	3	41
Gross unrealized losses	(424)	(242)
Estimated fair value	2,544	2,707
State and municipal
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	2,569	2,751
Gross unrealized gains	5	46
Gross unrealized losses	(326)	(192)
Estimated fair value	2,249	2,605
Mortgage and asset-backed
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	5,638	5,202
Gross unrealized gains	40	69
Gross unrealized losses	(190)	(121)
Estimated fair value	5,488	5,151
Government and agencies
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	677	1,015
Gross unrealized gains	0	4
Gross unrealized losses	(139)	(95)
Estimated fair value	$ 539	$ 924

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as noncurrent.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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