Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2011

Short-Term Borrowings [Abstract]

Primary Components Of Short-Term Borrowings

	Securities Sold Under Repurchase Agreements										Federal Funds Purchased
(Dollars in millions)		2011			2010			2009				2011			2010			2009
Balance at December 31		$	8,572		$	7,599		$	10,542			$	656		$	7,748		$	4,532
Maximum outstanding at any month-end			9,853			9,058			12,993				8,259			7,748			7,166
Average outstanding during the year			9,040			8,108			11,065				845			1,759			956
Weighted-average interest rate at year-end			.04	%		.04	%		.03	%			.05	%		.01	%		.01	%
Weighted-average interest rate during the year			.11			.05			.03				.05			.05			.04

	Tax-Exempt Investment Program									Corporate Commercial Paper Program
(Dollars in millions)	2011			2010			2009			2011			2010			2009
Balance at December 31	$	2,294		$	2,484		$	2,736		$	2,384		$	2,799		$	2,777
Maximum outstanding at any month-end		2,473			2,690			2,838			2,825			2,831			2,851
Average outstanding during the year		2,404			2,594			2,774			2,449			2,791			1,993
Weighted-average interest rate at year-end		.18	%		.37	%		.33	%		.22	%		.31	%		.21	%
Weighted-average interest rate during the year		.26			.33			.47			.23			.31			.30

	Conduit Commercial Paper  Program
(Dollars in millions)	2011			2010			2009 (1)
Balance at December 31				$	1,919		$	12,071
Maximum outstanding at any month-end	$	271			7,275			15,645
Average outstanding during the year		113			6,339			10,691
Weighted-average interest rate at year-end		—			.57	%		1.31	%
Weighted-average interest rate during the year		.47	%		.32			1.26

⁽¹⁾ Amounts other than balance and weighted-average interest rate at year-end related to the period subsequent to the May 2009 conduit consolidation.

Securities Sold Under Repurchase Agreements

(In millions)
Collateralized by securities purchased under resale agreements	$	5,651
Collateralized by investment securities		2,921
Total	$	8,572

Schedule Of U.S. Government Securities And Related Repurchase Agreements Including Accrued Interest

	U.S. Government Securities Sold				Repurchase Agreements
(Dollars in millions)	Amortized Cost		Fair Value		Amortized Cost		Rate
Overnight maturity	$	2,931	$	2,978	$	2,921		.001	%