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Accumulated Other Comprehensive Income (loss) - Reclassifications from Accumulated Other Comprehensive Income (Loss) to Income Statement (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Amortization of defined benefit pension:
Accumulated other comprehensive income, defined benefit pension net of tax	$ 5	$ 4
Selling, General & Administrative Expense [Member]
Amortization of defined benefit pension:
Accumulated other comprehensive income, defined benefit pension, before tax	5	4
Tax expense [Member]
Amortization of defined benefit pension:
Accumulated other comprehensive income, defined benefit pension, tax
Interest expense [Member]
Amortization of defined benefit pension:
Interest rate swaps

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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