Income Tax Provision (Narratives) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012
Operating Loss Carryforwards [Line Items]
Income Taxes Receivable	$ 24		$ 23
Net Taxes Paid	$ (2)	$ (117)

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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