INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	$ 0	$ 0
Estimated fair value	3,737	5,706
Gross unrealized gains	875	1,183
Gross unrealized losses	(2,661)	(2,406)
Other equity	344	331
Non-current investment securities, amortized cost	40,491	39,222
Non-current investment securities, estimated fair value	38,705	38,000
U.S. corporate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	27,477	27,495
Gross unrealized gains	757	1,034
Gross unrealized losses	(1,870)	(1,606)
Estimated fair value	26,365	26,923
Non-U.S. corporate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	2,509	2,529
Gross unrealized gains	26	34
Gross unrealized losses	(236)	(209)
Estimated fair value	2,299	2,353
State and municipal
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	2,803	2,828
Gross unrealized gains	54	79
Gross unrealized losses	(204)	(185)
Estimated fair value	2,654	2,723
Mortgage and asset-backed
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	4,878	4,827
Gross unrealized gains	36	34
Gross unrealized losses	(226)	(291)
Estimated fair value	4,688	4,571
Government and agencies
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, excluding accrued interest	2,478	1,213
Gross unrealized gains	1	3
Gross unrealized losses	(125)	(116)
Estimated fair value	2,355	1,100
GE HealthCare
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	0	0
Estimated fair value	2,776	4,761
AerCap
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost	0	0
Estimated fair value	$ 961	$ 944

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).

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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
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-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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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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-Topic 825
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-Section 45
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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 current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
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-Section S99
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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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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).

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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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