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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Summary of Short-Term Borrowings
Short-term borrowings at December 31 consisted of the following:
 
(Dollars in Millions)   2021        2020  
Federal funds purchased
  $ 628        $ 777  
Securities sold under agreements to repurchase
    1,575          1,430  
Commercial paper
    6,026          6,007  
Other short-term borrowings
    3,567          3,552  
   
 
 
 
Total
  $ 11,796        $ 11,766