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ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Roll Forward by Segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Allowance for credit losses          
Allowance for loan losses at beginning of period $ 12,355 $ 12,060 $ 12,626    
Charge-offs (8,665) (8,673) (8,222)    
Recoveries 1,552 1,597 1,661    
Replenishment of net charge-offs 7,113 7,076 6,561    
Net reserve builds (releases) 394 544 340    
Net specific reserve releases (153) (117) (152)    
Other (281) (132) (754)    
Allowance for loan losses at the end of year 12,315 12,355 12,060    
Sales or transfers of various consumer loan portfolios to held-for-sale          
Collectively evaluated in accordance with ASC 450       $ 10,872 $ 10,591
Individually evaluated in accordance with ASC 310-10-35       1,441 1,760
Allowance for loan losses 12,355 12,060 12,626 12,315 12,355
Loans, net of unearned income:          
Collectively evaluated in accordance with ASC 450       674,347 654,026
Individually evaluated in accordance with ASC 310-10-35       6,498 8,467
Held at fair value       3,223 4,374
Loans, net of unearned income       684,196 667,034
Receivables Acquired with Deteriorated Credit Quality          
Sales or transfers of various consumer loan portfolios to held-for-sale          
Purchased credit impaired in accordance with ASC 310-30       2 4
Loans, net of unearned income:          
Purchased credit impaired in accordance with ASC 310-30       128 167
Corporate          
Allowance for credit losses          
Allowance for loan losses at beginning of period 2,486 2,702 2,791    
Charge-offs (271) (491) (580)    
Recoveries 102 112 67    
Replenishment of net charge-offs 169 379 513    
Net reserve builds (releases) 56 (267) (85)    
Net specific reserve releases (159) 28 0    
Other (18) 23 (4)    
Allowance for loan losses at the end of year 2,365 2,486 2,702    
Sales or transfers of various consumer loan portfolios to held-for-sale          
Collectively evaluated in accordance with ASC 450       2,102 2,060
Individually evaluated in accordance with ASC 310-10-35       263 426
Allowance for loan losses 2,486 2,702 2,791 2,365 2,486
Loans, net of unearned income:          
Collectively evaluated in accordance with ASC 450       349,292 327,142
Individually evaluated in accordance with ASC 310-10-35       1,214 1,887
Held at fair value       3,203 4,349
Loans, net of unearned income       353,709  
Corporate | Receivables Acquired with Deteriorated Credit Quality          
Sales or transfers of various consumer loan portfolios to held-for-sale          
Purchased credit impaired in accordance with ASC 310-30       0 0
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 9,835    
Charge-offs (8,394) (8,182) (7,642)    
Recoveries 1,450 1,485 1,594    
Replenishment of net charge-offs 6,944 6,697 6,048    
Net reserve builds (releases) 338 811 425    
Net specific reserve releases 6 (145) (152)    
Other (263) (155) (750)    
Allowance for loan losses at the end of year 9,950 9,869 9,358    
Sales or transfers of various consumer loan portfolios to held-for-sale          
Collectively evaluated in accordance with ASC 450       8,770 8,531
Individually evaluated in accordance with ASC 310-10-35       1,178 1,334
Allowance for loan losses $ 9,869 $ 9,358 $ 9,835 9,950 9,869
Loans, net of unearned income:          
Collectively evaluated in accordance with ASC 450       325,055 326,884
Individually evaluated in accordance with ASC 310-10-35       5,284 6,580
Held at fair value       20 25
Loans, net of unearned income       330,487  
Consumer | Receivables Acquired with Deteriorated Credit Quality          
Sales or transfers of various consumer loan portfolios to held-for-sale          
Purchased credit impaired in accordance with ASC 310-30       2 4
Loans, net of unearned income:          
Purchased credit impaired in accordance with ASC 310-30       $ 128 $ 167