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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Components of Short-Term Borrowings
Selected financial information pertaining to the components of our short-term borrowings is as follows:
December 31,   
Dollars in millions202320222021
FEDERAL FUNDS PURCHASED
Balance at year end$ $4,006 $— 
Average during the year1,098 1,490 — 
Maximum month-end balance3,020 5,872 — 
Weighted-average rate during the year 4.83 %2.04 %— %
Weighted-average rate at December 31  4.18 — 
SECURITIES SOLD UNDER REPURCHASE AGREEMENTS
Balance at year end$38 $71 $173 
Average during the year549 617 239 
Maximum month-end balance1,954 1,090 281 
Weighted-average rate during the year 4.77 %1.66 %.02 %
Weighted-average rate at December 311.63 3.74 .01 
OTHER SHORT-TERM BORROWINGS
Balance at year end$3,053 $5,386 $588 
Average during the year5,890 2,963 770 
Maximum month-end balance1,061 11,372 897 
Weighted-average rate during the year 5.24 %1.82 %1.08 %
Weighted-average rate at December 315.58 .50 1.97