Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Components of Short-Term Borrowings

Selected financial information pertaining to the components of our short-term borrowings is as follows:

December 31,
dollars in millions	2015			2014			2013
FEDERAL FUNDS PURCHASED
Balance at year end	$	20		$	18		$	18
Average during the year		195			32			164
Maximum month-end balance		678			36			1,486
Weighted-average rate during the year (a)		.14	%		.10	%		.09	%
Weighted-average rate at December 31(a)		.05			.08			.10
SECURITIES SOLD UNDER REPURCHASE AGREEMENTS
Balance at year end	$	352		$	557		$	1,516
Average during the year		437			1,150			1,638
Maximum month-end balance		589			1,519			2,099
Weighted-average rate during the year (a)		.00	%		.16	%		.13	%
Weighted-average rate at December 31(a)		.00			.01			.15
OTHER SHORT-TERM BORROWINGS
Balance at year end	$	533		$	423		$	343
Average during the year		572			597			394
Maximum month-end balance		1,122			996			466
Weighted-average rate during the year (a)		1.52	%		1.49	%		1.89	%
Weighted-average rate at December 31(a)		1.78			1.58			2.00

(a) Rates exclude the effects of interest rate swaps and caps, which modify the repricing characteristics of certain short-term borrowings. For more information about such financial instruments, see Note 8 (“Derivatives and Hedging Activities”).