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Short-term Borrowings Short-term Borrowings (Tables)
12 Months Ended
Dec. 31, 2021
Short-term Debt [Abstract]  
Summary of Short-term Borrowings
The following table provides a summary of short-term borrowings.
(dollar amounts in millions)Federal Funds Purchased
and Securities Sold Under
Agreements to Repurchase
Other
Short-term
Borrowings
December 31, 2021
Amount outstanding at year-end$ $ 
Weighted average interest rate at year-end % %
Maximum month-end balance during the year$2 $ 
Average balance outstanding during the year2  
Weighted average interest rate during the year0.06 % %
December 31, 2020
Amount outstanding at year-end$— $— 
Weighted average interest rate at year-end— %— %
Maximum month-end balance during the year$1,513 $1,250 
Average balance outstanding during the year30 284 
Weighted average interest rate during the year0.97 %0.25 %
December 31, 2019
Amount outstanding at year-end$71 $— 
Weighted average interest rate at year-end1.50 %— %
Maximum month-end balance during the year$835 $1,200 
Average balance outstanding during the year113 256 
Weighted average interest rate during the year2.28 %2.44 %