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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Nonrecurring Fair Value Measurements (Details) - Nonrecurring
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Nonrecurring fair value changes included in earnings          
Nonrecurring fair value measurements included in earnings $ (17,000,000) $ (60,000,000) $ 66,000,000 $ (131,000,000)  
Loans held-for-sale          
Nonrecurring fair value changes included in earnings          
Nonrecurring fair value measurements included in earnings (1,000,000) 10,000,000 8,000,000 (15,000,000)  
Other real estate owned          
Nonrecurring fair value changes included in earnings          
Nonrecurring fair value measurements included in earnings (1,000,000) (4,000,000) (2,000,000) (6,000,000)  
Loans          
Nonrecurring fair value changes included in earnings          
Nonrecurring fair value measurements included in earnings (22,000,000) (66,000,000) (51,000,000) (110,000,000)  
Non-marketable equity investments measured using the measurement alternative          
Nonrecurring fair value changes included in earnings          
Nonrecurring fair value measurements included in earnings 7,000,000 $ 0 111,000,000 $ 0  
Level 3          
Valuation techniques and inputs          
Loans held-for-sale 2,953,000,000   2,953,000,000   $ 3,609,000,000
Level 3 | Price-based          
Valuation techniques and inputs          
Loans held-for-sale 2,533,000,000   2,533,000,000   3,186,000,000
Other real estate owned 17,000,000   17,000,000   42,000,000
Loans 54,000,000   54,000,000   133,000,000
Level 3 | Cash flow          
Valuation techniques and inputs          
Loans         129,000,000
Level 3 | Recovery analysis          
Valuation techniques and inputs          
Loans 123,000,000   123,000,000   127,000,000
Price | Level 3 | Price-based | Minimum          
Valuation techniques and inputs          
Loans held-for-sale 80.90   80.90   77.93
Other real estate owned 56.31   56.31   30.00
Loans         2.80
Price | Level 3 | Price-based | Maximum          
Valuation techniques and inputs          
Loans held-for-sale 100.00   100.00   100.00
Other real estate owned 56.31   56.31   50.36
Loans         100.00
Price | Level 3 | Price-based | Weighted Average          
Valuation techniques and inputs          
Loans held-for-sale 99.26   99.26   99.26
Other real estate owned 56.31   56.31   49.09
Loans         62.46
Price | Level 3 | Recovery analysis | Minimum          
Valuation techniques and inputs          
Loans 13.36   13.36    
Price | Level 3 | Recovery analysis | Maximum          
Valuation techniques and inputs          
Loans 100.00   100.00    
Price | Level 3 | Recovery analysis | Weighted Average          
Valuation techniques and inputs          
Loans 92.33   92.33    
Appraised value | Level 3 | Price-based | Minimum          
Valuation techniques and inputs          
Other real estate owned 2,353,777   2,353,777   20,278
Loans 9,855,140   9,855,140    
Appraised value | Level 3 | Price-based | Maximum          
Valuation techniques and inputs          
Other real estate owned 8,394,102   8,394,102   8,091,760
Loans 55,972,000   55,972,000    
Appraised value | Level 3 | Price-based | Weighted Average          
Valuation techniques and inputs          
Other real estate owned 7,071,276   7,071,276   4,016,665
Loans $ 38,154,269   $ 38,154,269    
Appraised value | Level 3 | Recovery analysis | Minimum          
Valuation techniques and inputs          
Loans         0
Appraised value | Level 3 | Recovery analysis | Maximum          
Valuation techniques and inputs          
Loans         45,500,000
Appraised value | Level 3 | Recovery analysis | Weighted Average          
Valuation techniques and inputs          
Loans         $ 38,785,667
Discount to price | Level 3 | Price-based | Minimum          
Valuation techniques and inputs          
Other real estate owned 0.1300   0.1300   0.3400
Discount to price | Level 3 | Price-based | Maximum          
Valuation techniques and inputs          
Other real estate owned 0.1300   0.1300   0.3400
Discount to price | Level 3 | Price-based | Weighted Average          
Valuation techniques and inputs          
Other real estate owned 0.1300   0.1300   0.3400
Recovery rate | Level 3 | Cash flow | Minimum          
Valuation techniques and inputs          
Loans         0.5000
Recovery rate | Level 3 | Cash flow | Maximum          
Valuation techniques and inputs          
Loans         1.0000
Recovery rate | Level 3 | Cash flow | Weighted Average          
Valuation techniques and inputs          
Loans         0.6359
Recovery rate | Level 3 | Recovery analysis | Minimum          
Valuation techniques and inputs          
Loans $ 0.0900   $ 0.0900    
Recovery rate | Level 3 | Recovery analysis | Maximum          
Valuation techniques and inputs          
Loans 0.9000   0.9000    
Recovery rate | Level 3 | Recovery analysis | Weighted Average          
Valuation techniques and inputs          
Loans $ 0.7662   $ 0.7662