Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Managemen Add Info (Details Add Info)

v3.19.2
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Managemen Add Info (Details Add Info) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Derivative, Notional Amount $ 20,877   $ 20,877   $ 4,877
Derivative, Average Remaining Maturity 2 years 7 months        
Document Period End Date     Jun. 30, 2019    
Increase decrease to net interest income due to derivative adjustment $ (15) $ (15) $ (29) $ (14)  
Asset conversion swaps - Receive Fixed - Generic          
Derivative [Line Items]          
Derivative, Notional Amount $ 5,937   $ 5,937   $ 12
Derivative, Average Remaining Maturity 3 years 6 months   3 years 6 months   1 year 2 months 12 days
Fair Value $ 48   $ 48   $ 0
Weighted-Average Rate Receive 1.87%   1.87%   2.20%
Weighted-Average Rate Pay 2.19%   2.19%   2.46%
Liability conversion swaps - Receive Fixed - Generic          
Derivative [Line Items]          
Derivative, Notional Amount $ 6,740   $ 6,740   $ 4,865
Derivative, Average Remaining Maturity     2 years 7 months 6 days   2 years 7 months 6 days
Fair Value $ 137   $ 137   $ 2
Weighted-Average Rate Receive 2.26%   2.26%   2.24%
Weighted-Average Rate Pay 2.44%   2.44%   2.54%
Interest Rate Swap [Member]          
Derivative [Line Items]          
Derivative, Notional Amount $ 12,677   $ 12,677   $ 4,877
Derivative, Average Remaining Maturity     3 years   2 years 7 months 6 days
Fair Value $ 185   $ 185   $ 2
Weighted-Average Rate Receive 2.08%   2.08%   2.24%
Weighted-Average Rate Pay 2.32%   2.32%   2.54%
Interest Rate Floor [Member]          
Derivative [Line Items]          
Derivative, Notional Amount $ 8,200   $ 8,200    
Derivative, Average Remaining Maturity     1 year 8 months 12 days    
Fair Value 49   $ 49    
Assigned [Member] | Interest Rate Floor [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 6,000   $ 6,000    
Derivative, Average Remaining Maturity     1 year 10 months 24 days    
Fair Value 39   $ 39    
Unassigned [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 2,200   2,200    
Unassigned [Member] | Interest Rate Floor [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 2,200   $ 2,200    
Derivative, Average Remaining Maturity     1 year 4 months 24 days    
Fair Value $ 10   $ 10