Short-term Borrowings

12 Months Ended

Dec. 31, 2013

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 commercial paper, borrowed securities, term federal funds purchased, short-term notes, and treasury tax and loan deposits generally mature within one to 120 days from the transaction date.

At December 31, 2013, Comerica Bank (the Bank), a subsidiary of the Corporation, had pledged loans totaling $24 billion which provided for up to $19 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, 2013
Amount outstanding at year-end	$	253		$	—
Weighted average interest rate at year-end	0.05		%	—		%
Maximum month-end balance during the year	$	277		$	—
Average balance outstanding during the year	211			—
Weighted average interest rate during the year	0.07		%	—		%
December 31, 2012
Amount outstanding at year-end	$	87		$	23
Weighted average interest rate at year-end	0.11		%	—		%
Maximum month-end balance during the year	$	87		$	23
Average balance outstanding during the year	76			—
Weighted average interest rate during the year	0.12		%	—		%
December 31, 2011
Amount outstanding at year-end	$	70		$	—
Weighted average interest rate at year-end	0.05		%	—		%
Maximum month-end balance during the year	$	317		$	18
Average balance outstanding during the year	137			1
Weighted average interest rate during the year	0.09		%	4.33		%