Short-term Borrowings Short-term Borrowings (Tables)

12 Months Ended

Dec. 31, 2015

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
December 31, 2015
Amount outstanding at year-end	$	23
Weighted average interest rate at year-end	0.38		%
Maximum month-end balance during the year	$	109
Average balance outstanding during the year	93
Weighted average interest rate during the year	0.05		%
December 31, 2014
Amount outstanding at year-end	$	116
Weighted average interest rate at year-end	0.04		%
Maximum month-end balance during the year	$	238
Average balance outstanding during the year	200
Weighted average interest rate during the year	0.04		%
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		%