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Capitalized Software Held for Sale (Changes in the Carrying Amount) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Capitalized Software Held for Sale [Abstract]
Capitalized software held for sale, net at beginning of period		$ 144	$ 152	$ 234
Amounts capitalized		49	47	64
Amortization expense		(56)	(53)	(75)
Impairment charges	(10)	(10)	0	(72)
Foreign currency translations adjustments, net		(1)	(2)	1
Capitalized software held for sale, net at end of period	$ 126	$ 126	$ 144	$ 152

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.