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Short-term Borrowings Short-term Borrowings (Tables)
12 Months Ended
Dec. 31, 2022
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, 2022
Amount outstanding at year-end$11 $3,200 
Weighted average interest rate at year-end4.32 %4.54 %
Maximum month-end balance during the year$1,106 $3,200 
Average balance outstanding during the year82 354 
Weighted average interest rate during the year3.28 %4.08 %
December 31, 2021
Amount outstanding at year-end$— $— 
Weighted average interest rate at year-end— %— %
Maximum month-end balance during the year$$— 
Average balance outstanding during the year— 
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 %