INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($) $ in Millions		1 Months Ended		6 Months Ended
		Jun. 30, 2022	Feb. 28, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Held-to-maturity debt securities
Amortized cost, net		$ 267,592		$ 267,592			$ 216,963
Gross unrealized gains		515		515			1,714
Gross unrealized losses		18,303		18,303			2,639
Fair value		249,804		249,804			216,038
Allowance for credit losses on HTM debt securities		105		105	$ 83	$ 85	87	$ 78	$ 86
Transfer of investment securities from AFS to HTM	[1],[2]			21,522	$ 0
Mortgage-backed securities - U.S. government-sponsored agency guaranteed
Held-to-maturity debt securities
Amortized cost, net		88,744		88,744			63,885
Gross unrealized gains		446		446			1,076
Gross unrealized losses		6,611		6,611			925
Fair value		82,579		82,579			64,036
Transfer of investment securities from AFS to HTM		21,500
Securities transferred from AFS to HTM, unrealized loss position		2,300		2,300
Mortgage-backed securities - Non-U.S. residential
Held-to-maturity debt securities
Amortized cost, net		541		541			736
Gross unrealized gains		0		0			3
Gross unrealized losses		0		0			0
Fair value		541		541			739
Commercial
Held-to-maturity debt securities
Amortized cost, net		1,157		1,157			1,070
Gross unrealized gains		5		5			4
Gross unrealized losses		1		1			2
Fair value		1,161		1,161			1,072
Mortgage-backed securities
Held-to-maturity debt securities
Amortized cost, net		90,442		90,442			65,691
Gross unrealized gains		451		451			1,083
Gross unrealized losses		6,612		6,612			927
Fair value		84,281		84,281			65,847
U.S. treasury securities
Held-to-maturity debt securities
Amortized cost, net		134,978		134,978			111,819
Gross unrealized gains		0		0			30
Gross unrealized losses		10,152		10,152			1,632
Fair value		124,826		124,826			110,217
State and municipal
Held-to-maturity debt securities
Amortized cost, net		9,076		9,076			8,923
Gross unrealized gains		60		60			589
Gross unrealized losses		594		594			12
Fair value		8,542		8,542			9,500
Transfer of investment securities from AFS to HTM			$ 237
Securities transferred from AFS to HTM, unrealized gain position			$ 14
Foreign government
Held-to-maturity debt securities
Amortized cost, net		2,016		2,016			1,651
Gross unrealized gains		0		0			4
Gross unrealized losses		90		90			36
Fair value		1,926		1,926			1,619
Asset-backed securities
Held-to-maturity debt securities
Amortized cost, net		31,080		31,080			28,879
Gross unrealized gains		4		4			8
Gross unrealized losses		855		855			32
Fair value		$ 30,229		$ 30,229			$ 28,855

[1] Operating and finance lease right-of-use assets and lease liabilities represent non-cash investing and financing activities, respectively, and are not included in the non-cash investing activities presented here. See Note 22 for more information and balances as of June 30, 2022.

[2] See Note 2 for further information on significant disposals.