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ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Roll Forward by Segment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Allowance for credit losses            
Allowance for loan losses at beginning of period $ 12,126 $ 12,025 $ 12,355 $ 12,060    
Charge-offs (2,094) (2,120) (6,499) (6,394)    
Recoveries 338 343 1,172 1,198    
Replenishment of net charge-offs 1,756 1,777 5,327 5,196    
Net reserve builds (releases) 169 419 302 466    
Net specific reserve builds (releases) (19) (50) (125) (175)    
Other 60 (28) (196) 15    
Allowance for loan losses at end of period 12,336 12,366 12,336 12,366    
Allowance for loan losses            
Collectively evaluated in accordance with ASC 450         $ 10,855 $ 10,591
Individually evaluated in accordance with ASC 310-10-35         1,479 1,760
Purchased credit impaired in accordance with ASC 310-30         2 4
Total allowance for loan losses 12,126 12,025 12,355 12,060 12,336 12,355
Loans, net of unearned income            
Collectively evaluated in accordance with ASC 450         663,590 654,026
Individually evaluated in accordance with ASC 310-10-35         6,949 8,467
Held at fair value         4,239 4,374
Loans, net of unearned income         674,909 667,034
Receivables Acquired with Deteriorated Credit Quality            
Loans, net of unearned income            
Purchased credit impaired in accordance with ASC 310-30         131 167
Corporate            
Allowance for credit losses            
Allowance for loan losses at beginning of period 2,330 2,510 2,486 2,702    
Charge-offs (36) (49) (195) (248)    
Recoveries 6 6 71 91    
Replenishment of net charge-offs 30 43 124 157    
Net reserve builds (releases) 34 (60) (15) (230)    
Net specific reserve builds (releases) (27) 21 (119) (18)    
Other 2 3 (13) 20    
Allowance for loan losses at end of period 2,339 2,474 2,339 2,474    
Allowance for loan losses            
Collectively evaluated in accordance with ASC 450         2,035 2,060
Individually evaluated in accordance with ASC 310-10-35           426
Purchased credit impaired in accordance with ASC 310-30         0 0
Total allowance for loan losses 2,330 2,510 2,486 2,702 2,339 2,486
Loans, net of unearned income            
Collectively evaluated in accordance with ASC 450         343,774 327,142
Individually evaluated in accordance with ASC 310-10-35         1,448 1,887
Held at fair value         4,218 4,349
Loans, net of unearned income         349,440 333,378
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 9,796 9,515 9,869 9,358    
Charge-offs (2,058) (2,071) (6,304) (6,146)    
Recoveries 332 337 1,101 1,107    
Replenishment of net charge-offs 1,726 1,734 5,203 5,039    
Net reserve builds (releases) 135 479 317 696    
Net specific reserve builds (releases) 8 (71) (6) (157)    
Other 58 (31) (183) (5)    
Allowance for loan losses at end of period 9,997 9,892 9,997 9,892    
Allowance for loan losses            
Collectively evaluated in accordance with ASC 450         8,820 8,531
Individually evaluated in accordance with ASC 310-10-35         1,175 1,334
Purchased credit impaired in accordance with ASC 310-30         2 4
Total allowance for loan losses $ 9,796 $ 9,515 $ 9,869 $ 9,358 9,997 9,869
Loans, net of unearned income            
Collectively evaluated in accordance with ASC 450         319,816 326,884
Individually evaluated in accordance with ASC 310-10-35         5,501 6,580
Held at fair value         21 25
Loans, net of unearned income         325,469 333,656
Consumer | Receivables Acquired with Deteriorated Credit Quality            
Loans, net of unearned income            
Purchased credit impaired in accordance with ASC 310-30         $ 131 $ 167