Income Taxes 4 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Deferred tax assets:
Share-based compensation	$ 30	$ 38
Accrued expenses	36	42
Net operating losses	131	158
Total deferred tax assets	659	730
Valuation allowances	(87)	(83)
Total deferred tax assets, net of valuation allowance	572	647
Deferred tax liabilities:
Depreciation	6	13
Capitalized development costs	158	209
Total deferred tax liabilities	274	360
Net deferred tax asset	298	287
Modified Accrual Basis Accounting for Revenue [Member]
Deferred tax assets:
Deferred tax assets, Other	373	379
Intangible Assets Amortizable for Tax Purposes [Member]
Deferred tax assets:
Deferred tax assets, Other	4	7
Deductible State Tax and Interest Benefits [Member]
Deferred tax assets:
Deferred tax assets, Other	20	51
Other [Member]
Deferred tax assets:
Deferred tax assets, Other	65	55
Purchased Software [Member]
Deferred tax liabilities:
Purchased software and other intangible assets	76	95
Other Intangible Assets [Member]
Deferred tax liabilities:
Purchased software and other intangible assets	$ 34	$ 43