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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Allowance for credit losses          
Allowance for loan losses at beginning of period $ 12,060 $ 12,626 $ 15,994    
Charge-offs (8,673) (8,222) (9,041)    
Recoveries 1,597 1,661 1,739    
Replenishment of net charge-offs 7,076 6,561 7,302    
Net reserve builds (releases) 544 340 139    
Net specific reserve releases (117) (152) (333)    
Other (132) (754) (3,174)    
Allowance for loan losses at the end of year 12,355 12,060 12,626    
Sales or transfers of various consumer loan portfolios to held-for-sale          
Collectively evaluated in accordance with ASC 450       $ 10,591 $ 10,054
Individually evaluated in accordance with ASC 310-10-35       1,760 2,000
Allowance for loan losses 12,060 12,626 15,994 12,355 12,060
Loans, net of unearned income:          
Collectively evaluated for impairment in accordance with ASC 450       654,026 610,266
Individually evaluated for impairment in accordance with ASC 310-10-35       8,467 10,430
Held at fair value       4,374 3,486
Loans, net of unearned income       667,034 624,369
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       4 6
Loans, net of unearned income:          
Purchased credit-impaired in accordance with ASC 310-30       167 187
Corporate          
Allowance for credit losses          
Allowance for loan losses at beginning of period 2,702 2,791 2,447    
Charge-offs (491) (580) (349)    
Recoveries 112 67 105    
Replenishment of net charge-offs 379 513 244    
Net reserve builds (releases) (267) (85) 550    
Net specific reserve releases 28 0 86    
Other 23 (4) (292)    
Allowance for loan losses at the end of year 2,486 2,702 2,791    
Sales or transfers of various consumer loan portfolios to held-for-sale          
Collectively evaluated in accordance with ASC 450       2,060 2,310
Individually evaluated in accordance with ASC 310-10-35       426 392
Allowance for loan losses 2,702 2,791 2,447 2,486 2,702
Loans, net of unearned income:          
Collectively evaluated for impairment in accordance with ASC 450       327,142 293,218
Individually evaluated for impairment in accordance with ASC 310-10-35       1,887 2,631
Held at fair value       4,349 3,457
Loans, net of unearned income       333,378 299,306
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 9,358 9,835 13,547    
Charge-offs (8,182) (7,642) (8,692)    
Recoveries 1,485 1,594 1,634    
Replenishment of net charge-offs 6,697 6,048 7,058    
Net reserve builds (releases) 811 425 (411)    
Net specific reserve releases (145) (152) (419)    
Other (155) (750) (2,882)    
Allowance for loan losses at the end of year 9,869 9,358 9,835    
Sales or transfers of various consumer loan portfolios to held-for-sale          
Collectively evaluated in accordance with ASC 450       8,531 7,744
Individually evaluated in accordance with ASC 310-10-35       1,334 1,608
Allowance for loan losses $ 9,358 $ 9,835 $ 13,547 9,869 9,358
Loans, net of unearned income:          
Collectively evaluated for impairment in accordance with ASC 450       326,884 317,048
Individually evaluated for impairment in accordance with ASC 310-10-35       6,580 7,799
Held at fair value       25 29
Loans, net of unearned income       333,656 325,063
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       4 6
Loans, net of unearned income:          
Purchased credit-impaired in accordance with ASC 310-30       $ 167 $ 187