Accounting Policies 2 (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies (Textual) [Abstract]
Percentage of cash and cash equivalents held by the Company's foreign subsidiaries outside the United States	64.00%
Interest payments, net	$ 56	$ 56
Income and other taxes paid, net	190	252
Excess tax benefits from options exercised included in financing activities from continuing operations	6	3
Assets acquired under capital leases	9
Purchase of software license	20
Share-based incentive awards	63	54
Withholding taxes on share-based incentive awards	34	26
Discretionary stock contributions to CA, Inc. Savings Harvest Plan	29	13
Other (Gains) Expenses, Net [Member]
Accounting Policies [Line Items]
Intellectual property assets transaction value	$ 35