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ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Roll Forward by Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Allowance for credit losses        
Allowance for loan losses at beginning of period $ 12,355 $ 12,060    
Charge-offs (2,296) (2,144)    
Recoveries 429 435    
Replenishment of net charge-offs 1,867 1,709    
Net reserve builds (releases) 102 (20)    
Net specific reserve builds (releases) (166) (14)    
Other 63 4    
Allowance for loan losses at end of period 12,354 12,030    
Allowance for loan losses        
Collectively evaluated in accordance with ASC 450     $ 10,785 $ 10,591
Individually evaluated in accordance with ASC 310-10-35     1,565 1,760
Purchased credit-impaired in accordance with ASC 310-30     4 4
Total allowance for loan losses 12,355 12,060 12,354 12,355
Loans, net of unearned income        
Collectively evaluated in accordance with ASC 450     660,342 654,026
Individually evaluated in accordance with ASC 310-10-35     7,934 8,467
Held at fair value     4,536 4,374
Loans, net of unearned income     672,938 667,034
Receivables Acquired with Deteriorated Credit Quality        
Loans, net of unearned income        
Purchased credit-impaired in accordance with ASC 310-30     126 167
Corporate        
Allowance for credit losses        
Allowance for loan losses at beginning of period 2,486 2,702    
Charge-offs (139) (103)    
Recoveries 43 66    
Replenishment of net charge-offs 96 37    
Net reserve builds (releases) (19) (166)    
Net specific reserve builds (releases) (155) (12)    
Other 3 11    
Allowance for loan losses at end of period 2,315 2,535    
Allowance for loan losses        
Collectively evaluated in accordance with ASC 450     2,045 2,060
Individually evaluated in accordance with ASC 310-10-35     270 426
Purchased credit-impaired in accordance with ASC 310-30     0 0
Total allowance for loan losses 2,486 2,702 2,315 2,486
Loans, net of unearned income        
Collectively evaluated in accordance with ASC 450     341,676 327,142
Individually evaluated in accordance with ASC 310-10-35     1,665 1,887
Held at fair value     4,513 4,349
Loans, net of unearned income     347,854 333,378
Corporate | Receivables Acquired with Deteriorated Credit Quality        
Loans, net of unearned income        
Purchased credit-impaired in accordance with ASC 310-30     0 0
Consumer        
Allowance for credit losses        
Allowance for loan losses at beginning of period 9,869 9,358    
Charge-offs (2,157) (2,041)    
Recoveries 386 369    
Replenishment of net charge-offs 1,771 1,672    
Net reserve builds (releases) 121 146    
Net specific reserve builds (releases) (11) (2)    
Other 60 (7)    
Allowance for loan losses at end of period 10,039 9,495    
Allowance for loan losses        
Collectively evaluated in accordance with ASC 450     8,740 8,531
Individually evaluated in accordance with ASC 310-10-35     1,295 1,334
Purchased credit-impaired in accordance with ASC 310-30     4 4
Total allowance for loan losses $ 9,869 $ 9,358 10,039 9,869
Loans, net of unearned income        
Collectively evaluated in accordance with ASC 450     318,666 326,884
Individually evaluated in accordance with ASC 310-10-35     6,269 6,580
Held at fair value     23 25
Loans, net of unearned income     325,084 333,656
Consumer | Receivables Acquired with Deteriorated Credit Quality        
Loans, net of unearned income        
Purchased credit-impaired in accordance with ASC 310-30     $ 126 $ 167