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Fair Values (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Investment securities:    
Equity securities $ 75 $ 48
Debt securities 8,370 4,599
Derivative assets 622 514
Total Assets 9,067 5,161
Liabilities    
Derivative liabilities 193 214
Total Liabilities 193 214
Fair Value, Inputs, Level 1 [Member]    
Investment securities:    
Equity securities 73 1
Debt securities 0 0
Derivative assets 0 0
Total Assets 73 1
Liabilities    
Derivative liabilities 0 0
Total Liabilities 0 0
Fair Value, Inputs, Level 2 [Member]    
Investment securities:    
Equity securities 2 47
Debt securities 8,370 4,599
Derivative assets 622 514
Total Assets 8,994 5,160
Liabilities    
Derivative liabilities 193 214
Total Liabilities 193 214
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