Investments in Marketable Securities (Tables)

3 Months Ended

Jun. 30, 2014

Investments in Marketable Securities [Abstract]

Summary of Investments in Marketable Securities

				June 30, 2014
				Amortized		Unrealized		Unrealized		Fair
(Dollars in millions)				cost		gains		losses		value
Available-for-sale securities:
	Debt instruments:
		U.S. government and agency obligations		$	1,130	$	2	$	-	$	1,132
		Municipal debt securities			11		1		-		12
		Certificates of deposit			914		-		-		914
		Commercial paper			329		-		-		329
		Corporate debt securities			138		6		-		144
		Mortgage-backed securities:
			U.S. government agency		57		2		-		59
			Non-agency residential		4		1		-		5
			Non-agency commercial		40		1		(1)		40
		Asset-backed securities			29		-		-		29
	Equity instruments:
		Fixed income mutual funds:
			Short-term sector fund		41		4		-		45
			U.S. government sector fund		330		7		-		337
			Municipal sector fund		21		2		-		23
			Investment grade corporate sector fund		286		37		-		323
			High-yield sector fund		38		8		-		46
			Real return sector fund		278		7		-		285
			Mortgage sector fund		523		10		-		533
			Asset-backed securities sector fund		41		10		-		51
			Emerging market sector fund		64		5		-		69
			International sector fund		171		2		-		173
		Equity mutual fund			210		277		-		487
Total investments in marketable securities				$	4,655	$	382	$	(1)	$	5,036

Note 3 – Investments in Marketable Securities (Continued)
					March 31, 2014
				Amortized		Unrealized		Unrealized		Fair
(Dollars in millions)				cost		gains		losses		value
Available-for-sale securities:
	Debt instruments:
		U.S. government and agency obligations		$	652	$	1	$	(1)	$	652
		Municipal debt securities			10		1		-		11
		Certificates of deposit			1,599		-		-		1,599
		Commercial paper			507		-		-		507
		Corporate debt securities			164		6		(1)		169
		Mortgage-backed securities:
			U.S. government agency		60		1		(1)		60
			Non-agency residential		4		1		-		5
			Non-agency commercial		44		1		(2)		43
		Asset-backed securities			27		-		-		27
	Equity instruments:
		Fixed income mutual funds:
			Short-term sector fund		41		3		-		44
			U.S. government sector fund		329		-		(2)		327
			Municipal sector fund		21		1		-		22
			Investment grade corporate sector fund		283		33		-		316
			High-yield sector fund		38		7		-		45
			Real return sector fund		275		-		(1)		274
			Mortgage sector fund		519		1		-		520
			Asset-backed securities sector fund		40		10		-		50
			Emerging market sector fund		65		1		-		66
			International sector fund		170		2		(1)		171
		Equity mutual fund			217		264		-		481
Total investments in marketable securities				$	5,065	$	333	$	(9)	$	5,389

Schedule of realized gains and losses on sales from AFS

	Three Months Ended
	June 30,
(Dollars in millions)	2014		2013
Available-for-sale securities:
Realized gains on sales	$	12	$	5
Realized losses on sales	$	-	$	(1)
Other-than-temporary impairment	$	-	$	(30)

Summary of Contractual Maturities of Available-for-Sale Securities

		June 30, 2014
(Dollars in millions)		Amortized cost		Fair value
Available-for-sale debt instruments:
	Due within 1 year	$	2,249	$	2,251
	Due after 1 year through 5 years		154		156
	Due after 5 years through 10 years		66		67
	Due after 10 years		53		57
	Mortgage-backed and asset-backed securities1		130		133
Total		$	2,652	$	2,664
1Mortgage-backed and asset-backed securities are shown separately because these securities do not have a single maturity date.