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Fair Values (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investment securities:    
Equity securities $ 75 $ 78
Debt securities 4,957 8,328
Derivative assets 2,206 343
Total Assets 7,238 8,749
Liabilities    
Derivative liabilities 419 440
Total Liabilities 419 440
Fair Value, Inputs, Level 1 [Member]    
Investment securities:    
Equity securities 74 77
Debt securities 0 0
Derivative assets 0 0
Total Assets 74 77
Liabilities    
Derivative liabilities 0 0
Total Liabilities 0 0
Fair Value, Inputs, Level 2 [Member]    
Investment securities:    
Equity securities 1 1
Debt securities 4,957 8,328
Derivative assets 2,206 343
Total Assets 7,164 8,672
Liabilities    
Derivative liabilities 419 440
Total Liabilities 419 440
Fair Value, Inputs, Level 3 [Member]    
Investment securities:    
Equity securities 0 0
Debt securities 0 0
Derivative assets 0 0
Total Assets 0 0
Liabilities    
Derivative liabilities 0 0
Total Liabilities $ 0 $ 0