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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2019
Short-term Debt [Line Items]  
Summary Of Short-Term Borrowings
(Dollar amounts in millions)2019  2018  2017  
Federal Home Loan Bank advances
Average amount outstanding$3,149  $2,971  $2,657  
Average rate2.50 %2.01 %1.13 %
Highest month-end balance$4,950  $5,400  $3,750  
Year-end balance1,000  4,500  3,600  
Average rate on outstandings at year-end1.73 %2.61 %1.44 %
Other short-term borrowings, year-end balances
Federal funds purchased$472  $541  $927  
Security repurchase agreements515  527  354  
Securities sold, not yet purchased66  85  95  
Total Federal Home Loan Bank advances and other short-term borrowings$2,053  $5,653  $4,976