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Fair Values (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Investment securities:    
Equity securities $ 99 $ 78
Debt securities 22,344 8,328
Derivatives, gross 879 343
Total Assets 23,322 8,749
Liabilities    
Derivatives, gross 316 440
Total Liabilities 316 440
Fair Value, Inputs, Level 1 [Member]    
Investment securities:    
Equity securities 98 77
Debt securities 0 0
Derivatives, gross 0 0
Total Assets 98 77
Liabilities    
Derivatives, gross 0 0
Total Liabilities 0 0
Fair Value, Inputs, Level 2 [Member]    
Investment securities:    
Equity securities 1 1
Debt securities 22,344 8,328
Derivatives, gross 879 343
Total Assets 23,224 8,672
Liabilities    
Derivatives, gross 316 440
Total Liabilities 316 440
Fair Value, Inputs, Level 3 [Member]    
Investment securities:    
Equity securities 0 0
Debt securities 0 0
Derivatives, gross 0 0
Total Assets 0 0
Liabilities    
Derivatives, gross 0 0
Total Liabilities $ 0 $ 0