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Significant Accounting Policies (Additional Information Regarding Capitalized Software Expenditures) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Significant Accounting Policies [Abstract]
Amounts capitalized	$ 47	$ 64	$ 75
Amortization expense	53	75	67
Asset impairment charge - capitalized software held for sale	0	72	0
Third-party royalty fees paid	$ 95	$ 72	$ 63

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

For each income statement presented, the amount charged to expense for write-downs of capitalized computer software costs to net realizable value.