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Fair Values (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Investment securities:    
Equity securities $ 102 $ 81
Debt securities 9,487  
Fair Value, Recurring    
Investment securities:    
Equity securities 102 81
Debt securities 9,487 21,550
Derivatives, gross 531 629
Total Assets 10,120 22,260
Liabilities    
Derivatives, gross 119 702
Total Liabilities 119 702
Level 1 | Fair Value, Recurring    
Investment securities:    
Equity securities 101 80
Debt securities 0 0
Derivatives, gross 0 0
Total Assets 101 80
Liabilities    
Derivatives, gross 0 0
Total Liabilities 0 0
Level 2 | Fair Value, Recurring    
Investment securities:    
Equity securities 1 1
Debt securities 9,462 21,550
Derivatives, gross 531 629
Total Assets 9,994 22,180
Liabilities    
Derivatives, gross 119 702
Total Liabilities 119 702
Level 3 | Fair Value, Recurring    
Investment securities:    
Equity securities 0 0
Debt securities 25 0
Derivatives, gross 0 0
Total Assets 25 0
Liabilities    
Derivatives, gross 0 0
Total Liabilities $ 0 $ 0