INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Gross unrealized gains	$ 804	$ 641
Gross unrealized losses	(2,958)	(3,148)
Other equity	229	225
Non-current investment securities, amortized cost	40,163	40,248
Non-current investment securities, estimated fair value	38,010	37,741
U.S. corporate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	28,222	28,456
Gross unrealized gains	662	546
Gross unrealized losses	(2,206)	(2,309)
Estimated fair value	26,678	26,692
Non-U.S. corporate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	2,920	2,970
Gross unrealized gains	28	23
Gross unrealized losses	(285)	(302)
Estimated fair value	2,663	2,691
State and municipal
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	2,356	2,409
Gross unrealized gains	38	22
Gross unrealized losses	(203)	(235)
Estimated fair value	2,192	2,196
Mortgage and asset-backed
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	5,258	5,007
Gross unrealized gains	70	47
Gross unrealized losses	(157)	(183)
Estimated fair value	5,172	4,870
Government and agencies
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	1,178	1,180
Gross unrealized gains	6	4
Gross unrealized losses	(108)	(118)
Estimated fair value	$ 1,075	$ 1,066

Debt And Equity Securities, Cost, Noncurrent

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amount excluding accrued interest, 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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6B
-Subparagraph (a)
-Publisher FASB
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