INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Gross unrealized gains	$ 4,792	$ 5,736
Gross unrealized losses	(716)	(31)
Equity	5,245	10,025
Amortized cost	38,223	42,816
Estimated fair value	42,299	48,521
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized cost	23,167	23,037
Gross unrealized gains	3,795	4,636
Gross unrealized losses	(493)	(11)
Estimated fair value	26,470	27,661
Non-U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,155	2,161
Gross unrealized gains	150	260
Gross unrealized losses	(60)	(1)
Estimated fair value	2,246	2,420
State and municipal
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,090	3,086
Gross unrealized gains	638	598
Gross unrealized losses	(21)	(15)
Estimated fair value	3,708	3,669
Mortgage and asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,296	3,117
Gross unrealized gains	51	116
Gross unrealized losses	(143)	(4)
Estimated fair value	3,205	3,229
Government and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,269	1,391
Gross unrealized gains	157	126
Gross unrealized losses	0	0
Estimated fair value	$ 1,427	$ 1,516

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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 of 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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