Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2012

Short-term Debt, Other Disclosures [Abstract]

Primary Components Of Short-Term Borrowings

The following tables present information with respect to the amounts outstanding and weighted-average interest rates of the primary components of short-term borrowings as of and for the years ended December 31:

	Securities Sold Under Repurchase Agreements									Federal Funds Purchased
(Dollars in millions)	2012			2011			2010			2012			2011			2010
Balance as of December 31	$	8,006		$	8,572		$	7,599		$	399		$	656		$	7,748
Maximum outstanding at any month-end	9,306			9,853			9,058			1,145			8,259			7,748
Average outstanding during the year	7,697			9,040			8,108			784			845			1,759
Weighted-average interest rate at year-end	.06		%	.04		%	.04		%	.13		%	.05		%	.01		%
Weighted-average interest rate during the year	.01			.11			.05			.09			.05			.05
	Tax-Exempt Investment Program									Corporate Commercial Paper Program
(Dollars in millions)	2012			2011			2010			2012			2011			2010
Balance as of December 31	$	2,148		$	2,294		$	2,484		$	2,318		$	2,384		$	2,799
Maximum outstanding at any month-end	2,274			2,473			2,690			2,503			2,825			2,831
Average outstanding during the year	2,214			2,404			2,594			2,382			2,449			2,791
Weighted-average interest rate at year-end	.17		%	.18		%	.37		%	.22		%	.22		%	.31		%
Weighted-average interest rate during the year	.21			.26			.33			.23			.23			.31

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

Securities Sold Under Repurchase Agreements

The following table presents the components of securities sold under repurchase agreements by underlying collateral as of December 31, 2012:

(In millions)
Collateralized by securities purchased under resale agreements	$	2,026
Collateralized by investment securities	5,980
Total	$	8,006

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

The following table presents information about these U.S. government securities and the related repurchase agreements, including accrued interest, as of December 31, 2012. The table excludes repurchase agreements collateralized by securities purchased under resale agreements.

	U.S. Government Securities Sold				Repurchase Agreements
(Dollars in millions)	Amortized Cost		Fair Value		Amortized Cost		Rate
Overnight maturity	$	6,076	$	6,120	$	5,980	.016	%