Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Non-recurring/Fair Values of Financial Instruments (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Non-recurring/Fair Values of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale $ 781 $ 613
Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans   $ 33
Nonrecurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
MSRs 206  
Impaired loans 26  
Nonrecurring | Total Gains/(Losses)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
MSRs (14)  
Impaired loans 1  
Nonrecurring | Level 1 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
MSRs 0  
Impaired loans 0  
Nonrecurring | Level 2 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
MSRs 0  
Impaired loans 0  
Nonrecurring | Level 3 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
MSRs 206  
Impaired loans $ 26