Investment Securities (Tables)

6 Months Ended

Jun. 30, 2013

Investment Securities (Tables) [Abstract]

Schedule of Available for Sale Securities by Type

The following is a summary of investment securities as of June 30, 2013 and December 31, 2012:

		2013								2012
					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		$	4,351	$	81	$	(43)	$	4,389	$	4,280	$	199	$	(5)	$	4,474
U.S. Government agency
	obligations		3		―		―		3		3		―		―		3
U.S. Government treasury
	obligations		280		5		―		285		330		8		―		338
Corporate debt securities			40		3		―		43		73		6		―		79
Mortgage-backed securities^(a)			170		6		―		176		210		14		―		224
Equity securities^(b)			46		143		―		189		64		232		―		296
Foreign government bonds and
	obligations		122		6		(1)		127		134		15		―		149
Other^(c)			51		―		(1)		50		51		―		―		51
Total		$	5,063	$	244	$	(45)	$	5,262	$	5,145	$	474	$	(5)	$	5,614

Represents mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae.
Primarily represents the Company's investment in 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 June 30, 2013 and December 31, 2012:

		2013								2012
		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		$	992	$	(32)	$	66	$	(11)	$	100	$	(1)	$	73	$	(4)
Foreign government bonds and
	obligations		42		(1)		―		―		―		―		―		―
Other			―		―		17		(1)		―		―		―		―
Total		$	1,034	$	(33)	$	83	$	(12)	$	100	$	(1)	$	73	$	(4)

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 June 30, 2013 and December 31, 2012:

	Less than 12 months					12 months or more					Total
Ratio of Fair Value to					Gross					Gross					Gross
Amortized Cost	Number of		Estimated		Unrealized	Number of		Estimated		Unrealized	Number of		Estimated		Unrealized
(Dollars in millions)	Securities		Fair Value		Losses	Securities		Fair Value		Losses	Securities		Fair Value		Losses
2013:
90%–100%	241	$	994	$	(28)	3	$	17	$	(1)	244	$	1,011	$	(29)
Less than 90%	7		40		(5)	4		66		(11)	11		106		(16)
Total as of June 30, 2013	248	$	1,034	$	(33)	7	$	83	$	(12)	255	$	1,117	$	(45)

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)

Contractual maturities of investment securities

Contractual maturities of investment securities, excluding equity securities and other securities, as of June 30, 2013 were as follows:

				Estimated
(Millions)		Cost		Fair Value
Due within 1 year	$	432	$	433
Due after 1 year but within 5 years		392		399
Due after 5 years but within 10 years		176		184
Due after 10 years		3,966		4,007
Total	$	4,966	$	5,023