Income Taxes 4 (Details) - USD ($) $ in Millions	Mar. 31, 2016	Mar. 31, 2015
Deferred tax assets:
Modified accrual basis accounting for revenue	$ 391	$ 349
Share-based compensation	36	31
Accrued expenses	42	36
Net operating losses	135	96
Total deferred tax assets	696	604
Valuation allowances	(96)	(85)
Total deferred tax assets, net of valuation allowance	600	519
Deferred tax liabilities:
Depreciation	4	3
Other intangible assets	39	17
Total deferred tax liabilities	196	161
Net deferred tax asset	404	358
Intangible Assets Amortizable for Tax Purposes
Deferred tax assets:
Deferred tax assets, Other	2	3
Deductible State Tax and Interest Benefits
Deferred tax assets:
Deferred tax assets, Other	17	20
Other
Deferred tax assets:
Deferred tax assets, Other	73	69
Purchased Software
Deferred tax liabilities:
Capitalized software	100	48
Internally Developed Software
Deferred tax liabilities:
Capitalized software	$ 53	$ 93