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SECURITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]                
Impaired debt securities sold $ 0 $ 0 $ 0 $ 0        
Taxable interest income from securities 154 141 314 286        
Securities purchased under agreements to resell, gross 0   0     $ 0    
Securities purchased under agreements to resell, offset 0   0     0    
Securities purchased under agreements to resell 0   0     0    
Securities sold under agreements to repurchase, gross 0   0     0    
Securities sold under agreements to repurchase, offset 0   0     0    
Securities sold under agreements to repurchase 0   0     0    
Mortgage-backed securities                
Schedule of Available-for-sale Securities [Line Items]                
Securitizations of mortgage loans 22 5 44 5        
Available-for-sale Securities                
Schedule of Available-for-sale Securities [Line Items]                
Cumulative credit losses recognized in earnings 79 73 79 73 $ 75 $ 75 $ 66 $ 66
OTTI in earnings 4 7 5 8        
OTTI in earnings from an evaluation model update   5   5        
Held-to-maturity Securities                
Schedule of Available-for-sale Securities [Line Items]                
Cumulative credit losses recognized in earnings $ 0 $ 0 $ 0 $ 0