Income Taxes 4 (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets:
Modified accrual basis accounting for revenue	$ 364	$ 391
Share-based compensation	41	36
Accrued expenses	11	42
Net operating losses	149	135
Total deferred tax assets	646	696
Valuation allowances	(89)	(96)
Total deferred tax assets, net of valuation allowance	557	600
Deferred tax liabilities:
Depreciation	3	4
Other intangible assets	116	39
Total deferred tax liabilities	349	196
Net deferred tax asset	208	404
Deductible State Tax and Interest Benefits
Deferred tax assets:
Deferred tax assets, Other	19	17
Other
Deferred tax assets:
Deferred tax assets, Other	62	75
Purchased Software
Deferred tax liabilities:
Capitalized software	207	100
Internally Developed Software
Deferred tax liabilities:
Capitalized software	$ 23	$ 53