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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year $ 16,541     $ 16,541 $ 16,455 $ 24,956 $ 16,541
Gross credit losses on loans         (5,156) (6,720) (9,263)
Gross recoveries on loans         1,367 1,825 1,652
Net credit losses on loans (NCLs)         (3,789) (4,895) (7,611)
Net reserve builds (releases) for loans         937 (7,283) 7,635
Net specific reserve builds (releases) for loans         19 (715) 676
Total provision for credit losses on loans (PCLL)         4,745 (3,103) 15,922
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period         0 0 4
Other, net         (437) (503) 100
ACLL at end of year         16,974 16,455 24,956
Allowance for credit losses on unfunded commitments              
Allowance for credit losses on unfunded commitments (ACLUC) at beginning of period 1,456     1,456 1,871 2,655 1,456
Provision (release) for credit losses on unfunded lending commitments         291 (788) 1,446
Other, net         (11) 4 (53)
ACLUC at end of period         2,151 1,871 2,655
Total allowance for credit losses on loans, leases and unfunded lending commitments         19,125 18,326 27,611
Sales or transfers of various consumer loan portfolios to held-for-sale              
Other liabilities, at fair value         87,873 74,920  
Previously reported              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year 12,783     12,783     12,783
Variable post-charge-off third-party collection costs              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year (443) $ (426)   (443)     (443)
Total provision for credit losses on loans (PCLL)   122 $ 339 (18)      
ACLL at end of year (443) $ (122) $ (426)        
Revision              
Allowance for credit losses on unfunded commitments              
Allowance for credit losses on unfunded commitments (ACLUC) at beginning of period         (68)    
ACLUC at end of period           (68)  
Sales or transfers of various consumer loan portfolios to held-for-sale              
Other liabilities, at fair value           68  
Cumulative effect of adoption              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year 4,201     4,201     4,201
Net reserve builds (releases) for loans 4,900            
ACLL at end of year 4,100            
Allowance for credit losses on unfunded commitments              
Allowance for credit losses on unfunded commitments (ACLUC) at beginning of period (194)     (194)     (194)
Adjusted balance              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year           24,956  
ACLL at end of year             24,956
Corporate              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year 1,911     1,911 2,415 4,776 1,911
Gross credit losses on loans         (278) (500) (976)
Gross recoveries on loans         100 114 76
Net credit losses on loans (NCLs)         (178) (386) (900)
Net reserve builds (releases) for loans         374 (2,075) 2,551
Net specific reserve builds (releases) for loans         65 (255) 249
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period         0 0 0
Other, net         1 (31) 65
ACLL at end of year         2,855 2,415 4,776
Sales or transfers of various consumer loan portfolios to held-for-sale              
FX translation         (87) (133) 104
Corporate | Previously reported              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year 2,727     2,727     2,727
Corporate | Variable post-charge-off third-party collection costs              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year 0     0     0
Corporate | Cumulative effect of adoption              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year (816)     (816)     (816)
Consumer              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year 14,630     14,630 14,040 20,180 14,630
Gross credit losses on loans         (4,878) (6,220) (8,287)
Gross recoveries on loans         1,267 1,711 1,576
Net credit losses on loans (NCLs)         (3,611) (4,509) (6,711)
Net reserve builds (releases) for loans         563 (5,208) 5,084
Net specific reserve builds (releases) for loans         (46) (460) 427
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period         0 0 4
Other, net         (438) (472) 35
ACLL at end of year         14,119 14,040 20,180
Sales or transfers of various consumer loan portfolios to held-for-sale              
Transfer of real estate loan portfolios         0 0 (4)
Reclasses of consumer ACLL to HFS         (350) (370) (4)
Consumer | Previously reported              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year 10,056     10,056     10,056
Consumer | Variable post-charge-off third-party collection costs              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year (443)     (443)     (443)
Consumer | Asia Consumer Loan              
Sales or transfers of various consumer loan portfolios to held-for-sale              
Reclass consumer to held-for sale         (350) 0 0
Consumer | Australia Consumer Loan              
Sales or transfers of various consumer loan portfolios to held-for-sale              
Reclass consumer to held-for sale         0 (280) 0
Consumer | Philippines Consumer Loan              
Sales or transfers of various consumer loan portfolios to held-for-sale              
Reclass consumer to held-for sale         $ 0 $ (90) 0
Consumer | Cumulative effect of adoption              
Allowance for credit losses              
Allowance for credit losses on loans (ACLL) at beginning of year $ 5,017     $ 5,017     $ 5,017