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Securities - Securities by Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Amortized Cost of Securities Available for sale, Due in one year or less $ 896  
Amortized Cost of Securities Available for sale, Due after one through five years 21,029  
Amortized Cost of Securities Available for sale, Due after five through ten years 8,440  
Amortized Cost of Securities Available for sale, Due after ten years 3,638  
Amortized Cost 34,003 $ 26,810
Fair Value of Securities Available for sale, Due in one year or less 903  
Fair Value of Securities Available for sale, Due after one through five years 21,233  
Fair Value of Securities Available for sale, Due after five through ten years 8,397  
Fair Value of Securities Available for sale, Due after ten years 3,390  
Total Fair Value of Securities Available For Sale 33,923 27,556
Amortized Cost of Held-to-Maturity Securities, Due in one year or less 84  
Amortized Cost of Held-to-Maturity Securities, Due after one through five years 4,603  
Amortized Cost of Held-to-Maturity Securities, Due after five through ten years 2,170  
Amortized Cost of Held-to-Maturity Securities, Due after ten years 0  
Amortized Cost 6,857 7,595
Fair Value of Held-to-Maturity Securities, Due in one year or less 84  
Fair Value of Held-to-Maturity Securities, Due after one through five years 4,771  
Fair Value of Held-to-Maturity Securities, Due after five through ten years 2,304  
Fair Value of Held-to-Maturity Securities, Due after ten years 0  
Total Fair Value of Held-to-Maturity Securities $ 7,159 $ 8,023