Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net income	$ 1,156	$ 875	$ 8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	197	220	227
Loss on Conversion of Convertible Notes	10	0	0
Stock-based compensation	178	144	150
Acquisition-related contingent consideration	0	(3)	(35)
Net losses (gains) on investments	0	0	(2)
Change in assets and liabilities:
Receivables, net	127	(54)	(12)
Inventories	3	19	(13)
Other assets	19	87	(56)
Accounts payable	13	(46)	(18)
Accrued and other liabilities	(252)	31	(3)
Deferred income taxes, net	(403)	1	16
Deferred net revenue (online-enabled games)	175	(207)	446
Net cash provided by operating activities	1,223	1,067	712
INVESTING ACTIVITIES
Capital expenditures	(93)	(95)	(97)
Proceeds from maturities and sales of short-term investments	941	727	401
Purchase of short-term investments	(1,332)	(1,102)	(600)
Acquisition of subsidiaries, net of cash acquired	0	0	(5)
Net cash used in investing activities	(484)	(470)	(301)
FINANCING ACTIVITIES
Proceeds from issuance of senior notes, net of issuance costs	989	0	0
Payment of 0.75% Convertible Senior Notes due 2016	(470)	0	0
Proceeds from issuance of common stock	107	60	77
Excess tax benefit from stock-based compensation	86	22	13
Repurchase and retirement of common stock	(1,018)	(337)	0
Acquisition-related contingent consideration payment	0	0	(1)
Net cash provided by (used in) financing activities	(306)	(255)	89
Effect of foreign exchange on cash and cash equivalents	(8)	(56)	(10)
Increase (decrease) in cash and cash equivalents	425	286	490
Beginning cash and cash equivalents	2,068	1,782	1,292
Ending cash and cash equivalents	2,493	2,068	1,782
Supplemental cash flow information:
Cash paid during the year for income taxes, net	35	2	29
Cash paid during the year for interest	$ 4	$ 6	$ 6