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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Allowance for credit losses            
Allowance for loan losses at beginning of period $ 12,025 $ 12,304 $ 12,060 $ 12,626    
Charge-offs (2,120) (1,948) (6,394) (6,139)    
Recoveries 343 423 1,198 1,274    
Allowance for Loan and Lease Losses Write-offs, Net 1,777 1,525 5,196 4,865    
Net reserve builds (releases) 419 258 466 210    
Net specific reserve builds (releases) (50) (37) (175) (53)    
Other (28) (86) 15 (344)    
Allowance for loan losses at end of period 12,366 12,439 12,366 12,439    
Allowance for loan losses            
Collectively evaluated in accordance with ASC 450         $ 10,648 $ 10,054
Individually evaluated in accordance with ASC 310-10-35         1,713 2,000
Purchased credit-impaired in accordance with ASC 310-30         5 6
Total allowance for loan losses 12,025 12,304 12,060 12,626 12,366 12,060
Loans, net of unearned income            
Collectively evaluated in accordance with ASC 450         639,854 610,342
Individually evaluated in accordance with ASC 310-10-35         8,844 10,354
Held at fair value         4,308 3,486
Loans, net of unearned income         653,183 624,369
Receivables Acquired with Deteriorated Credit Quality            
Loans, net of unearned income            
Purchased credit-impaired in accordance with ASC 310-30         177 187
Corporate            
Allowance for credit losses            
Allowance for loan losses at beginning of period 2,510 2,872 2,702 2,791    
Charge-offs (49) (63) (248) (445)    
Recoveries 6 23 91 52    
Allowance for Loan and Lease Losses Write-offs, Net 43 40 157 393    
Net reserve builds (releases) (60) (110) (230) (122)    
Net specific reserve builds (releases) 21 (1) (18) 89    
Other 3 5 20 8    
Allowance for loan losses at end of period 2,474 2,766 2,474 2,766    
Allowance for loan losses            
Collectively evaluated in accordance with ASC 450         2,098 2,310
Individually evaluated in accordance with ASC 310-10-35         376 392
Purchased credit-impaired in accordance with ASC 310-30         0 0
Total allowance for loan losses 2,510 2,872 2,702 2,791 2,474 2,702
Loans, net of unearned income            
Collectively evaluated in accordance with ASC 450         321,239 293,294
Individually evaluated in accordance with ASC 310-10-35         2,087 2,555
Held at fair value         4,281 3,457
Loans, net of unearned income         327,607 299,306
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 9,515 9,432 9,358 9,835    
Charge-offs (2,071) (1,885) (6,146) (5,694)    
Recoveries 337 400 1,107 1,222    
Allowance for Loan and Lease Losses Write-offs, Net 1,734 1,485 5,039 4,472    
Net reserve builds (releases) 479 368 696 332    
Net specific reserve builds (releases) (71) (36) (157) (142)    
Other (31) (91) (5) (352)    
Allowance for loan losses at end of period 9,892 9,673 9,892 9,673    
Allowance for loan losses            
Collectively evaluated in accordance with ASC 450         8,550 7,744
Individually evaluated in accordance with ASC 310-10-35         1,337 1,608
Purchased credit-impaired in accordance with ASC 310-30         5 6
Total allowance for loan losses $ 9,515 $ 9,432 $ 9,358 $ 9,835 9,892 9,358
Loans, net of unearned income            
Collectively evaluated in accordance with ASC 450         318,615 317,048
Individually evaluated in accordance with ASC 310-10-35         6,757 7,799
Held at fair value         27 29
Loans, net of unearned income         325,576 325,063
Consumer | Receivables Acquired with Deteriorated Credit Quality            
Loans, net of unearned income            
Purchased credit-impaired in accordance with ASC 310-30         $ 177 $ 187