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Short-term Borrowings
 12 Months Ended
Dec. 31, 2021
Short-term Debt [Abstract]  
Short-term Borrowings SHORT-TERM BORROWINGS
Federal funds purchased and securities sold under agreements to repurchase generally mature within one to four days from the transaction date. Other short-term borrowings, which may consist of borrowed securities and short-term notes, generally mature within one to 120 days from the transaction date.
At December 31, 2021, Comerica Bank (the Bank), a wholly-owned subsidiary of the Corporation, had pledged loans totaling $21.2 billion which provided for up to $17.0 billion of available collateralized borrowing with the FRB.
The following table provides a summary of short-term borrowings.
(dollar amounts in millions)Federal Funds Purchased
and Securities Sold Under
Agreements to Repurchase		Other
Short-term
Borrowings
December 31, 2021
Amount outstanding at year-end$— $— 
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 %