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Short-term Borrowings Short-term Borrowings (Tables)
 12 Months Ended
Dec. 31, 2013
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, 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
%