INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($) $ in Millions		1 Months Ended			9 Months Ended
		Sep. 30, 2022	Jun. 30, 2022	Feb. 28, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Held-to-maturity debt securities
Amortized cost, net		$ 267,864			$ 267,864		$ 216,963
Gross unrealized gains		28			28		1,714
Gross unrealized losses		28,085			28,085		2,639
Fair value		239,807			239,807		216,038
Allowance for credit losses on HTM debt securities		115	$ 105		115	$ 73	87	$ 83	$ 86
Transfer of investment securities from AFS to HTM	[1],[2]				21,688	$ 0
Mortgage-backed securities - U.S. government-sponsored agency guaranteed
Held-to-maturity debt securities
Amortized cost, net		89,020			89,020		63,885
Gross unrealized gains		2			2		1,076
Gross unrealized losses		11,160			11,160		925
Fair value		77,862			77,862		64,036
Transfer of investment securities from AFS to HTM			21,500
Securities transferred from AFS to HTM, unrealized loss position			$ 2,300
Mortgage-backed securities - Non-U.S. residential
Held-to-maturity debt securities
Amortized cost, net		467			467		736
Gross unrealized gains		0			0		3
Gross unrealized losses		0			0		0
Fair value		467			467		739
Commercial
Held-to-maturity debt securities
Amortized cost, net		1,100			1,100		1,070
Gross unrealized gains		4			4		4
Gross unrealized losses		1			1		2
Fair value		1,103			1,103		1,072
Mortgage-backed securities
Held-to-maturity debt securities
Amortized cost, net		90,587			90,587		65,691
Gross unrealized gains		6			6		1,083
Gross unrealized losses		11,161			11,161		927
Fair value		79,432			79,432		65,847
U.S. treasury securities
Held-to-maturity debt securities
Amortized cost, net		134,969			134,969		111,819
Gross unrealized gains		0			0		30
Gross unrealized losses		14,672			14,672		1,632
Fair value		120,297			120,297		110,217
State and municipal
Held-to-maturity debt securities
Amortized cost, net		9,215			9,215		8,923
Gross unrealized gains		18			18		589
Gross unrealized losses		1,111			1,111		12
Fair value		8,122			8,122		9,500
Transfer of investment securities from AFS to HTM		165		$ 237
Securities transferred from AFS to HTM, unrealized loss position		12			12
Securities transferred from AFS to HTM, unrealized gain position				$ 14
Foreign government
Held-to-maturity debt securities
Amortized cost, net		2,014			2,014		1,651
Gross unrealized gains		0			0		4
Gross unrealized losses		115			115		36
Fair value		1,899			1,899		1,619
Asset-backed securities
Held-to-maturity debt securities
Amortized cost, net		31,079			31,079		28,879
Gross unrealized gains		4			4		8
Gross unrealized losses		1,026			1,026		32
Fair value		$ 30,057			$ 30,057		$ 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 23 for more information and balances as of September 30, 2022.

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