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Investments in Marketable Securities (Realized Gains and Losses On AFS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Realized gains and losses on sales of available-for-sale securities
Realized gains on sales	$ 11	$ 5	$ 16	$ 9
Realized losses on sales	(2)	(1)	(3)	(2)
Impairment write-downs	$ (23)	$ 0	$ (53)	$ 0

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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