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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Nonrecurring Fair Value Measurements (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Nonrecurring fair value changes included in earnings    
Nonrecurring fair value measurements included in earnings $ (159,000,000) $ 42,000,000
Loans held-for-sale    
Nonrecurring fair value changes included in earnings    
Nonrecurring fair value measurements included in earnings (91,000,000) 0
Other real estate owned    
Nonrecurring fair value changes included in earnings    
Nonrecurring fair value measurements included in earnings (1,000,000) (1,000,000)
Loans    
Nonrecurring fair value changes included in earnings    
Nonrecurring fair value measurements included in earnings (137,000,000) (56,000,000)
Non-marketable equity securities    
Nonrecurring fair value changes included in earnings    
Nonrecurring fair value measurements included in earnings 70,000,000 99,000,000
Nonrecurring | Level 3    
Valuation techniques and inputs    
Loans held-for-sale 2,897,000,000 1,330,000,000
Nonrecurring | Level 3 | Price-based    
Valuation techniques and inputs    
Loans held-for-sale 2,683,000,000 1,320,000,000
Other real estate owned 7,000,000 11,000,000
Loans 147,000,000  
Nonrecurring | Level 3 | Recovery Analysis    
Valuation techniques and inputs    
Other real estate owned 4,000,000 5,000,000
Loans 73,000,000 100,000,000
Nonrecurring | Level 3 | Cash flow    
Valuation techniques and inputs    
Loans   54,000,000
Price | Nonrecurring | Level 3 | Price-based    
Valuation techniques and inputs    
Loans   66,000,000
Price | Nonrecurring | Level 3 | Price-based | Minimum    
Valuation techniques and inputs    
Loans held-for-sale, measurement input, value 79 86
Loans, measurement input, value 2 17,521,218
Price | Nonrecurring | Level 3 | Price-based | Maximum    
Valuation techniques and inputs    
Loans held-for-sale, measurement input, value 100 100
Loans, measurement input, value 49 43,646,426
Price | Nonrecurring | Level 3 | Price-based | Weighted Average    
Valuation techniques and inputs    
Loans held-for-sale, measurement input, value 98 99
Loans, measurement input, value 23 30,583,822
Price | Nonrecurring | Level 3 | Recovery Analysis | Minimum    
Valuation techniques and inputs    
Other real estate owned, measurement input, value 51  
Price | Nonrecurring | Level 3 | Recovery Analysis | Maximum    
Valuation techniques and inputs    
Other real estate owned, measurement input, value 51  
Price | Nonrecurring | Level 3 | Recovery Analysis | Weighted Average    
Valuation techniques and inputs    
Other real estate owned, measurement input, value 51  
Price | Nonrecurring | Level 3 | Cash flow | Minimum    
Valuation techniques and inputs    
Loans, measurement input, value   2
Price | Nonrecurring | Level 3 | Cash flow | Maximum    
Valuation techniques and inputs    
Loans, measurement input, value   54
Price | Nonrecurring | Level 3 | Cash flow | Weighted Average    
Valuation techniques and inputs    
Loans, measurement input, value   27
Appraised value | Nonrecurring | Level 3 | Minimum    
Valuation techniques and inputs    
Loans, measurement input, value 34  
Appraised value | Nonrecurring | Level 3 | Maximum    
Valuation techniques and inputs    
Loans, measurement input, value 43,646,426  
Appraised value | Nonrecurring | Level 3 | Weighted Average    
Valuation techniques and inputs    
Loans, measurement input, value 17,762,950  
Appraised value | Nonrecurring | Level 3 | Price-based | Minimum    
Valuation techniques and inputs    
Other real estate owned, measurement input, value 3,110,711 2,297,358
Appraised value | Nonrecurring | Level 3 | Price-based | Maximum    
Valuation techniques and inputs    
Other real estate owned, measurement input, value 4,241,357 8,394,102
Appraised value | Nonrecurring | Level 3 | Price-based | Weighted Average    
Valuation techniques and inputs    
Other real estate owned, measurement input, value $ 3,586,975 $ 5,615,884
Recovery rate | Nonrecurring | Level 3 | Recovery Analysis | Minimum    
Valuation techniques and inputs    
Loans, measurement input 0.99% 0.57%
Recovery rate | Nonrecurring | Level 3 | Recovery Analysis | Maximum    
Valuation techniques and inputs    
Loans, measurement input 78.00% 100.00%
Recovery rate | Nonrecurring | Level 3 | Recovery Analysis | Weighted Average    
Valuation techniques and inputs    
Loans, measurement input 13.37% 64.78%
Cost of Capital | Nonrecurring | Level 3 | Price-based    
Valuation techniques and inputs    
Loans   $ 47,000,000
Cost of Capital | Nonrecurring | Level 3 | Price-based | Minimum    
Valuation techniques and inputs    
Loans, measurement input   0.10%
Cost of Capital | Nonrecurring | Level 3 | Price-based | Maximum    
Valuation techniques and inputs    
Loans, measurement input   100.00%
Cost of Capital | Nonrecurring | Level 3 | Price-based | Weighted Average    
Valuation techniques and inputs    
Loans, measurement input   54.84%