Investment Securities (Tables)

12 Months Ended

Dec. 31, 2012

Investment Securities (Tables) [Abstract]

Schedule of Available for Sale Securities by Type

The following is a summary of investment securities as of December 31:

	2012								2011
			Gross		Gross		Estimated				Gross		Gross		Estimated
			Unrealized		Unrealized		Fair				Unrealized		Unrealized		Fair
Description of Securities (Millions)		Cost	Gains		Losses		Value			Cost	Gains		Losses		Value
State and municipal obligations	$	4,280	$	199	$	(5)	$	4,474	$	4,968	$	103	$	(72)	$	4,999
U.S. Government agency obligations		3		―		―		3		352		2		―		354
U.S. Government treasury obligations		330		8		―		338		330		10		―		340
Corporate debt securities(a)		73		6		―		79		626		9		(3)		632
Mortgage-backed securities(b)		210		14		―		224		261		17		―		278
Equity securities(c)		64		232		―		296		95		265		―		360
Foreign government bonds and obligations		134		15		―		149		120		10		―		130
Other(d)		51		―		―		51		54		―		―		54
Total	$	5,145	$	474	$	(5)	$	5,614	$	6,806	$	416	$	(75)	$	7,147

• The December 31, 2012and 2011balances include, on a cost basis, nil and $600million, respectively, of corporate debt obligations issued under the Temporary Liquidity Guarantee Program (TLGP) that are guaranteed by the Federal Deposit Insurance Corporation (FDIC).
• Represents mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae.
• Primarily represents the Company's investment in the Industrial and Commercial Bank of China (ICBC).
• Other comprises investments in various mutual funds.

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value

The following table provides information about the Company's investment securities with gross unrealized losses and the length of time that individual securities have been in a continuous unrealized loss position as of December 31:

	2012								2011
	Less than 12 months				12 months or more				Less than 12 months				12 months or more
			Gross					Gross			Gross				Gross
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
Description of Securities (Millions)	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
State and municipal obligations	$	100	$	(1)	$	73	$	(4)	$	―	$	―	$	1,094	$	(72)
Corporate debt securities		―		―		―		―		15		(2)		2		(1)
Total	$	100	$	(1)	$	73	$	(4)	$	15	$	(2)	$	1,096	$	(73)

Available for Sale Securities Ratio of Fair Value to Amortized Cost

The following table summarizes the gross unrealized losses due to temporary impairments by ratio of fair value to amortized cost as of December 31:

	Less than 12 months					12 months or more					Total
				Gross					Gross					Gross
Ratio of Fair Value to	Number of	Estimated		Unrealized		Number of	Estimated		Unrealized		Number of	Estimated		Unrealized
Amortized Cost (Dollars in millions)	Securities	Fair Value		Losses		Securities	Fair Value		Losses		Securities	Fair Value		Losses
2012:
90%–100%	46	$	100	$	(1)	4	$	73	$	(4)	50	$	173	$	(5)
Total as of December 31, 2012	46	$	100	$	(1)	4	$	73	$	(4)	50	$	173	$	(5)
2011:
90%–100%	―	$	―	$	―	114	$	884	$	(35)	114	$	884	$	(35)
Less than 90%	1		15		(2)	22		212		(38)	23		227		(40)
Total as of December 31, 2011	1	$	15	$	(2)	136	$	1,096	$	(73)	137	$	1,111	$	(75)

Gross realized gains and losses on the sales of investment securities

Gross realized gains and losses on the sales of investment securities, included in other non-interest revenues, were as follows:

(Millions)	2012		2011		2010
Gains	$	127	$	16	$	1
Losses		(1)		―		(6)
Total	$	126	$	16	$	(5)

Contractual maturities of investment securities

Contractual maturities of investment securities, excluding equity securities and other securities, as of December 31,2012were as follows:

			Estimated
(Millions)	Cost		Fair Value
Due within 1 year	$	318	$	319
Due after 1 year but within 5 years		255		264
Due after 5 years but within 10 years		204		220
Due after 10 years		4,253		4,464
Total	$	5,030	$	5,267