Electronic Arts (EA) 10-Q 7 Nov 17 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Sep. 30, 2017	Nov. 02, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	EA
Entity Registrant Name	ELECTRONIC ARTS INC.
Entity Central Index Key	712,515
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		307,925,453

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017	[1]
ASSETS:
Cash and cash equivalents	$ 2,067	$ 2,565
Short-term investments	2,288	1,967
Receivables, net of allowances of $116 and $145, respectively	812	359
Other current assets	248	308
Total current assets	5,415	5,199
Property and equipment, net	444	434
Goodwill	1,711	1,707
Acquisition-related intangibles, net	5	8
Deferred income taxes, net	248	286
Other assets	99	84
TOTAL ASSETS	7,922	7,718
LIABILITIES:
Accounts payable	187	87
Accrued and other current liabilities	969	789
Deferred net revenue (online-enabled games)	1,116	1,539
Total current liabilities	2,272	2,415
Senior notes, net	991	990
Income tax obligations	122	104
Deferred income taxes, net	1	1
Other liabilities	148	148
TOTAL LIABILITIES	3,534	3,658
Commitments and contingencies (See Note 11)
STOCKHOLDERS' EQUITY:
Common stock, $0.01 par value. 1,000 shares authorized; 308 and 308 shares issued and outstanding, respectively	3	3
Additional paid-in capital	817	1,049
Retained earnings	3,641	3,027
Accumulated other comprehensive loss	(73)	(19)
Total stockholders' equity	4,388	4,060
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 7,922	$ 7,718
[1]	Derived from audited Consolidated Financial Statements.

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Receivables, allowances	$ 116	$ 145
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	308	308
Common stock, shares outstanding	308	308

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net revenue:
Product	$ 454	$ 420	$ 1,282	$ 1,104
Service and other	505	478	1,126	1,065
Total net revenue	959	898	2,408	2,169
Cost of revenue:
Product	300	317	364	407
Service and other	89	84	179	173
Total cost of revenue	389	401	543	580
Gross profit	570	497	1,865	1,589
Operating expenses:
Research and development	331	291	656	585
Marketing and sales	160	143	281	271
General and administrative	118	111	223	219
Amortization of intangibles	2	1	3	3
Total operating expenses	611	546	1,163	1,078
Operating income (loss)	(41)	(49)	702	511
Interest and other income (expense), net	3	(3)	9	(11)
Income (loss) before provision for (benefit from) income taxes	(38)	(52)	711	500
Provision for (benefit from) income taxes	(16)	(14)	89	98
Net income (loss)	$ (22)	$ (38)	$ 622	$ 402
Earnings (loss) per share:
Basic	$ (0.07)	$ (0.13)	$ 2.01	$ 1.34
Diluted	$ (0.07)	$ (0.13)	$ 1.99	$ 1.28
Number of shares used in computation:
Basic	309	301	309	301
Diluted	309	301	313	315

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income (loss)	$ (22)	$ (38)	$ 622	$ 402
Other comprehensive income (loss), net of tax:
Net gains (losses) on available-for-sale securities	0	(2)	0	0
Net gains (losses) on derivative instruments	(34)	(5)	(90)	17
Foreign currency translation adjustments	32	(6)	36	(11)
Total other comprehensive income (loss), net of tax	(2)	(13)	(54)	6
Total comprehensive income (loss)	$ (24)	$ (51)	$ 568	$ 408

Condensed Consolidated Stateme6

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2017		Sep. 30, 2016
OPERATING ACTIVITIES
Net income (loss)	$ 622		$ 402
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation, amortization and accretion	63		91
Stock-based compensation	110		96
Change in assets and liabilities:
Receivables, net	(454)		(493)
Other assets	66		37
Accounts payable	104		133
Accrued and other liabilities	100		109
Deferred income taxes, net	40		20
Deferred net revenue (online-enabled games)	(423)		(391)
Net cash provided by operating activities	228		4
INVESTING ACTIVITIES
Capital expenditures	(63)		(69)
Proceeds from maturities and sales of short-term investments	1,050		644
Purchase of short-term investments	(1,395)		(824)
Net cash used in investing activities	(408)		(249)
FINANCING ACTIVITIES
Payment of convertible notes	0		(163)
Proceeds from issuance of common stock	57		31
Cash paid to taxing authorities for shares withheld from employees	(105)		(106)
Repurchase and retirement of common stock	(303)		(256)
Net cash used in financing activities	(351)		(494)
Effect of foreign exchange on cash and cash equivalents	33		(8)
Decrease in cash and cash equivalents	(498)		(747)
Beginning cash and cash equivalents	2,565	[1]	2,493
Ending cash and cash equivalents	2,067		1,746
Supplemental cash flow information:
Cash paid during the period for income taxes, net	28		26
Cash paid during the period for interest	21		22
Non-cash Investing activities
Change in accrued capital expenditures	$ (6)		$ (17)
[1]	Derived from audited Consolidated Financial Statements.

Description Of Business And Bas

Description Of Business And Basis Of Presentation	6 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description Of Business And Basis Of Presentation	(1) DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION We are a global leader in digital interactive entertainment. We develop, market, publish and deliver games, content and online services that can be played by consumers on a variety of platforms, which include game consoles, PCs, mobile phones and tablets. In our games, we use established brands that we either wholly own (such as Battlefield, Mass Effect, Need for Speed, The Sims and Plants v. Zombies) or license from others (such as FIFA, Madden NFL and Star Wars). We also publish and distribute games developed by third parties ( e.g. , Titanfall). Our fiscal year is reported on a 52 - or 53 -week period that ends on the Saturday nearest March 31. Our results of operations for the fiscal year ending March 31, 2018 contains 52 weeks and ends on March 31, 2018. Our results of operations for the fiscal year ended March 31, 2017 contained 52 weeks and ended on April 1, 2017. Our results of operations for the three months ended September 30, 2017 and 2016 contained 13 weeks each and ended on September 30, 2017 and October 1, 2016, respectively. Our results of operations for the six months ended September 30, 2017 and 2016 contained 26 each and ended on September 30, 2017 and October 1, 2016, respectively. For simplicity of disclosure, all fiscal periods are referred to as ending on a calendar month end. The Condensed Consolidated Financial Statements are unaudited and reflect all adjustments (consisting only of normal recurring accruals unless otherwise indicated) that, in the opinion of management, are necessary for a fair presentation of the results for the interim periods presented. The preparation of these Condensed Consolidated Financial Statements requires management to make estimates and assumptions that affect the amounts reported in these Condensed Consolidated Financial Statements and accompanying notes. Actual results could differ materially from those estimates. The results of operations for the current interim periods are not necessarily indicative of results to be expected for the current year or any other period. These Condensed Consolidated Financial Statements should be read in conjunction with the Condensed Consolidated Financial Statements and Notes thereto included in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017 , as filed with the United States Securities and Exchange Commission (“SEC”) on May 24, 2017 . Reclassifications Certain prior year amounts were reclassified to conform to current year presentation. Recently Adopted Accounting Standards As a result of the adoption of ASU 2016-09 at the beginning of fiscal year 2018, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting , excess tax benefits of $3 million and $42 million for the three and six months ended September 30, 2017 , respectively, were reflected in the Condensed Consolidated Statement of Income as a component of the provision for income taxes, whereas for the three and six months ended September 30, 2016 , they were recognized in additional paid-in-capital. The pronouncement also resulted in two changes to our cash flow presentation, which we applied retrospectively for comparability. Excess tax benefits are now presented as operating activities rather than financing activities, and cash payments to tax authorities in connection with shares withheld to meet statutory tax withholding requirements are now presented as a financing activity. The net increase to our reported net cash provided by operating activities and corresponding increase to cash used in financing activities resulting from the adoption of ASU 2016-09 for the six months ended September 30, 2017 and 2016 are as follows: Six months ended September 30, (In millions): 2017 2016 Excess tax benefit from stock-based compensation $ 42 $ 37 Cash paid to taxing authorities for shares withheld from employees 105 106 Increase to net cash provided by operating activities and net cash used in financing activities $ 147 $ 143

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	(2) FAIR VALUE MEASUREMENTS There are various valuation techniques used to estimate fair value, the primary one being the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value, we consider the principal or most advantageous market in which we would transact and consider assumptions that market participants would use when pricing the asset or liability. We measure certain financial and nonfinancial assets and liabilities at fair value on a recurring and nonrecurring basis. Fair Value Hierarchy The three levels of inputs that may be used to measure fair value are as follows: • Level 1 . Quoted prices in active markets for identical assets or liabilities. • Level 2 . Observable inputs other than quoted prices included within Level 1, such as quoted prices for similar assets or liabilities, quoted prices in markets with insufficient volume or infrequent transactions (less active markets), or model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated with observable market data for substantially the full term of the assets or liabilities. • Level 3 . Unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of assets or liabilities. Assets and Liabilities Measured at Fair Value on a Recurring Basis As of September 30, 2017 and March 31, 2017 , our assets and liabilities that were measured and recorded at fair value on a recurring basis were as follows (in millions): Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Financial Instruments Significant Other Observable Inputs Significant Unobservable Inputs As of (Level 1) (Level 2) (Level 3) Balance Sheet Classification Assets Bank and time deposits $ 304 $ 304 $ — $ — Cash equivalents Money market funds 93 93 — — Cash equivalents Available-for-sale securities: Corporate bonds 1,247 — 1,247 — Short-term investments and cash equivalents U.S. Treasury securities 453 453 — — Short-term investments and cash equivalents U.S. agency securities 133 — 133 — Short-term investments and cash equivalents Commercial paper 320 — 320 — Short-term investments and cash equivalents Foreign government securities 101 — 101 — Short-term investments Asset-backed securities 119 — 119 — Short-term investments Certificates of deposit 26 — 26 — Short-term investments Foreign currency derivatives 9 — 9 — Other current assets and other assets Deferred compensation plan assets (a) 10 10 — — Other assets Total assets at fair value $ 2,815 $ 860 $ 1,955 $ — Liabilities Foreign currency derivatives 48 — 48 — Accrued and other current liabilities and other liabilities Deferred compensation plan liabilities (a) 10 10 — — Other liabilities Total liabilities at fair value $ 58 $ 10 $ 48 $ — Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Financial Instruments Significant Other Observable Inputs Significant Unobservable Inputs As of (Level 1) (Level 2) (Level 3) Balance Sheet Classification Assets Bank and time deposits $ 233 $ 233 $ — $ — Cash equivalents Money market funds 405 405 — — Cash equivalents Available-for-sale securities: Corporate bonds 963 — 963 — Short-term investments and cash equivalents U.S. Treasury securities 460 460 — — Short-term investments and cash equivalents U.S. agency securities 172 — 172 — Short-term investments and cash equivalents Commercial paper 270 — 270 — Short-term investments and cash equivalents Foreign government securities 113 — 113 — Short-term investments Asset-backed securities 135 — 135 — Short-term investments Foreign currency derivatives 19 — 19 — Other current assets and other assets Deferred compensation plan assets (a) 8 8 — — Other assets Total assets at fair value $ 2,778 $ 1,106 $ 1,672 $ — Liabilities Foreign currency derivatives 8 — 8 — Accrued and other current liabilities and other liabilities Deferred compensation plan liabilities (a) 9 9 — — Other liabilities Total liabilities at fair value $ 17 $ 9 $ 8 $ — (a) The Deferred Compensation Plan assets consist of various mutual funds. See Note 13 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017 , for additional information regarding our Deferred Compensation Plan.

Financial Instruments

Financial Instruments	6 Months Ended
	Sep. 30, 2017
Financial Instruments [Abstract]
Financial Instruments	(3) FINANCIAL INSTRUMENTS Cash and Cash Equivalents As of September 30, 2017 and March 31, 2017 , our cash and cash equivalents were $2,067 million and $2,565 million , respectively. Cash equivalents were valued using quoted market prices or other readily available market information. Short-Term Investments Short-term investments consisted of the following as of September 30, 2017 and March 31, 2017 (in millions): As of September 30, 2017 As of March 31, 2017 Cost or Amortized Cost Gross Unrealized Fair Value Cost or Amortized Cost Gross Unrealized Fair Value Gains Losses Gains Losses Corporate bonds $ 1,235 $ — $ (1 ) $ 1,234 $ 944 $ — $ (1 ) $ 943 U.S. Treasury securities 410 — (1 ) 409 414 — (1 ) 413 U.S. agency securities 132 — (1 ) 131 152 — (1 ) 151 Commercial paper 268 — — 268 212 — — 212 Foreign government securities 101 — — 101 113 — — 113 Asset-backed securities 119 — — 119 135 — — 135 Certificates of deposit 26 — — 26 — — — — Short-term investments $ 2,291 $ — $ (3 ) $ 2,288 $ 1,970 $ — $ (3 ) $ 1,967 The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of September 30, 2017 and March 31, 2017 (in millions): As of September 30, 2017 As of March 31, 2017 Amortized Cost Fair Value Amortized Cost Fair Value Short-term investments Due within 1 year $ 1,592 $ 1,591 $ 1,237 $ 1,236 Due 1 year through 5 years 696 694 721 719 Due after 5 years 3 3 12 12 Short-term investments $ 2,291 $ 2,288 $ 1,970 $ 1,967

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	(4) DERIVATIVE FINANCIAL INSTRUMENTS The assets or liabilities associated with our derivative instruments and hedging activities are recorded at fair value in other current assets/other assets, or accrued and other current liabilities/other liabilities, respectively, on our Condensed Consolidated Balance Sheets. As discussed below, the accounting for gains and losses resulting from changes in fair value depends on the use of the derivative instrument and whether it is designated and qualifies for hedge accounting. We transact business in various foreign currencies and have significant international sales and expenses denominated in foreign currencies, subjecting us to foreign currency risk. We purchase foreign currency forward contracts, generally with maturities of 18 months or less, to reduce the volatility of cash flows primarily related to forecasted revenue and expenses denominated in certain foreign currencies. Our cash flow risks are primarily related to fluctuations in the Euro, British pound sterling, Canadian dollar, Swedish krona, Australian dollar, Chinese yuan and South Korean won. In addition, we utilize foreign currency forward contracts to mitigate foreign currency exchange risk associated with foreign-currency-denominated monetary assets and liabilities, primarily intercompany receivables and payables. The foreign currency forward contracts not designated as hedging instruments generally have a contractual term of approximately 3 months or less and are transacted near month-end. We do not use foreign currency forward contracts for speculative trading purposes. Cash Flow Hedging Activities Certain of our forward contracts are designated and qualify as cash flow hedges. The effectiveness of the cash flow hedge contracts, including time value, is assessed monthly using regression analysis, as well as other timing and probability criteria. To qualify for hedge accounting treatment, all hedging relationships are formally documented at the inception of the hedges and must be highly effective in offsetting changes to future cash flows on hedged transactions. The derivative assets or liabilities associated with our hedging activities are recorded at fair value in other current assets/other assets, or accrued and other current liabilities/other liabilities, respectively, on our Condensed Consolidated Balance Sheets. The effective portion of gains or losses resulting from changes in the fair value of these hedges is initially reported, net of tax, as a component of accumulated other comprehensive income (loss) in stockholders’ equity. The gross amount of the effective portion of gains or losses resulting from changes in the fair value of these hedges is subsequently reclassified into net revenue or research and development expenses, as appropriate, in the period when the forecasted transaction is recognized in our Condensed Consolidated Statements of Operations. In the event that the gains or losses in accumulated other comprehensive income (loss) are deemed to be ineffective, the ineffective portion of gains or losses resulting from changes in fair value, if any, is reclassified to interest and other income (expense), net, in our Condensed Consolidated Statements of Operations. In the event that the underlying forecasted transactions do not occur, or it becomes remote that they will occur, within the defined hedge period, the gains or losses on the related cash flow hedges are reclassified from accumulated other comprehensive income (loss) to interest and other income (expense), net, in our Condensed Consolidated Statements of Operations. Total gross notional amounts and fair values for currency derivatives with cash flow hedge accounting designation are as follows (in millions): As of September 30, 2017 As of March 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Asset Liability Asset Liability Forward contracts to purchase $ 167 $ 8 $ — $ 185 $ — $ 5 Forward contracts to sell $ 1,146 $ 1 $ 48 $ 840 $ 19 $ 3 The net impact of the effective portion of gains and losses from our cash flow hedging activities in our Condensed Consolidated Statements of Operations was a gain of $5 million for the three months ended September 30, 2017 and a gain of $5 million for the three months ended September 30, 2016 . The net impact of the effective portion of gains and losses from our cash flow hedging activities in our Condensed Consolidated Statements of Operations was a gain of $22 million for the six months ended September 30, 2017 and a gain of $11 million for the six months ended September 30, 2016 . The amount excluded from the assessment of hedge effectiveness during the three months ended September 30, 2017 and 2016 and recognized in interest and other income (expense), net, was immaterial. The amount excluded from the assessment of hedge effectiveness was a gain of $5 million for the six months ended September 30, 2017 and recognized in interest and other income (expense), net. The amount excluded from the assessment of hedge effectiveness was immaterial for the six months ended September 30, 2016 . Balance Sheet Hedging Activities Our foreign currency forward contracts that are not designated as hedging instruments are accounted for as derivatives whereby the fair value of the contracts are reported as other current assets or accrued and other current liabilities on our Condensed Consolidated Balance Sheets, and gains and losses resulting from changes in the fair value are reported in interest and other income (expense), net, in our Condensed Consolidated Statements of Operations. The gains and losses on these foreign currency forward contracts generally offset the gains and losses in the underlying foreign-currency-denominated monetary assets and liabilities, which are also reported in interest and other income (expense), net, in our Condensed Consolidated Statements of Operations. Total gross notional amounts and fair values for currency derivatives that are not designated as hedging instruments are accounted for as follows (in millions): As of September 30, 2017 As of March 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Asset Liability Asset Liability Forward contracts to purchase $ 139 $ — $ — $ 87 $ — $ — Forward contracts to sell $ 425 $ — $ — $ 166 $ — $ — The effect of foreign currency forward contracts not designated as hedging instruments in our Condensed Consolidated Statements of Operations for the three and six months ended September 30, 2017 and 2016 , was as follows (in millions): Statement of Operations Classification Amount of Gain (Loss) Recognized in the Statement of Operations Three Months Ended Six Months Ended 2017 2016 2017 2016 Foreign currency forward contracts not designated as hedging instruments Interest and other income (expense), net $ (3 ) $ 3 $ (9 ) $ 1

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income (Loss)	(5) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended September 30, 2017 and 2016 are as follows (in millions): Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of June 30, 2017 $ (3 ) $ (24 ) $ (44 ) $ (71 ) Other comprehensive income (loss) before reclassifications — (29 ) 32 3 Amounts reclassified from accumulated other comprehensive income (loss) — (5 ) — (5 ) Total other comprehensive income (loss), net of tax — (34 ) 32 (2 ) Balance as of September 30, 2017 $ (3 ) $ (58 ) $ (12 ) $ (73 ) Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of June 30, 2016 $ 3 $ 36 $ (36 ) $ 3 Other comprehensive income (loss) before reclassifications (1 ) (1 ) (6 ) (8 ) Amounts reclassified from accumulated other comprehensive income (loss) (1 ) (4 ) — (5 ) Total other comprehensive income (loss), net of tax (2 ) (5 ) (6 ) (13 ) Balance as of September 30, 2016 $ 1 $ 31 $ (42 ) $ (10 ) The changes in accumulated other comprehensive income (loss) by component, net of tax, for the six months ended September 30, 2017 and 2016 are as follows (in millions): Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of March 31, 2017 $ (3 ) $ 32 $ (48 ) $ (19 ) Other comprehensive income (loss) before reclassifications — (68 ) 46 (22 ) Amounts reclassified from accumulated other comprehensive income (loss) — (22 ) (10 ) (32 ) Total other comprehensive income (loss), net of tax — (90 ) 36 (54 ) Balance as of September 30, 2017 $ (3 ) $ (58 ) $ (12 ) $ (73 ) Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of March 31, 2016 $ 1 $ 14 $ (31 ) $ (16 ) Other comprehensive income (loss) before reclassifications 1 27 (11 ) 17 Amounts reclassified from accumulated other comprehensive income (loss) (1 ) (10 ) — (11 ) Total other comprehensive income (loss), net of tax — 17 (11 ) 6 Balance as of September 30, 2016 $ 1 $ 31 $ (42 ) $ (10 ) The effects on net income of amounts reclassified from accumulated other comprehensive income (loss) for the three and six months ended September 30, 2017 were as follows (in millions): Amount Reclassified From Accumulated Other Comprehensive Income (Loss) Statement of Operations Classification Three Months Ended Six Months Ended (Gains) losses on cash flow hedges from forward contracts Net revenue $ (3 ) $ (22 ) Research and development (2 ) — Total, net of tax $ (5 ) $ (22 ) (Gains) losses on foreign currency translation Interest and other income (expense), net $ — $ (10 ) Total, net of tax $ — $ (10 ) Total net (gain) loss reclassified, net of tax $ (5 ) $ (32 ) The effects on net income of amounts reclassified from accumulated other comprehensive income (loss) for the three and six months ended September 30, 2016 were as follows (in millions): Amount Reclassified From Accumulated Other Comprehensive Income (Loss) Statement of Operations Classification Three Months Ended Six Months Ended (Gains) losses on available-for-sale securities Interest and other income (expense), net $ (1 ) $ (1 ) Total, net of tax $ (1 ) $ (1 ) (Gains) losses on cash flow hedges from forward contracts Net revenue $ (4 ) $ (9 ) Research and development — (1 ) Total, net of tax $ (4 ) $ (10 ) Total net (gain) loss reclassified, net of tax $ (5 ) $ (11 )

Goodwill And Acquisition-Relate

Goodwill And Acquisition-Related Intangibles, Net	6 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Acquisition-Related Intangibles, Net	(6) GOODWILL AND ACQUISITION-RELATED INTANGIBLES, NET The changes in the carrying amount of goodwill for the six months ended September 30, 2017 are as follows (in millions): As of Activity Effects of Foreign Currency Translation As of Goodwill $ 2,075 $ — $ 4 $ 2,079 Accumulated impairment (368 ) — — (368 ) Total $ 1,707 $ — $ 4 $ 1,711 Goodwill represents the excess of the purchase price over the fair value of the underlying acquired net tangible and intangible assets. Acquisition-related intangibles consisted of the following (in millions): As of September 30, 2017 As of March 31, 2017 Gross Carrying Amount Accumulated Amortization Acquisition- Related Intangibles, Net Gross Carrying Amount Accumulated Amortization Acquisition- Related Intangibles, Net Developed and core technology $ 412 $ (412 ) $ — $ 412 $ (412 ) $ — Trade names and trademarks 106 (101 ) 5 106 (98 ) 8 Registered user base and other intangibles 5 (5 ) — 5 (5 ) — Carrier contracts and related 85 (85 ) — 85 (85 ) — Total $ 608 $ (603 ) $ 5 $ 608 $ (600 ) $ 8 Amortization of intangibles for the three and six months ended September 30, 2017 and 2016 are classified in the Condensed Consolidated Statement of Operations as follows (in millions): Three Months Ended Six Months Ended 2017 2016 2017 2016 Cost of service and other $ — $ 8 $ — $ 16 Cost of product — 4 — 9 Operating expenses 2 1 3 3 Total $ 2 $ 13 $ 3 $ 28 Acquisition-related intangible assets are amortized using the straight-line method over the lesser of their estimated useful lives or the agreement terms, typically from 2 to 14 years . As of September 30, 2017 and March 31, 2017 , the weighted-average remaining useful life for acquisition-related intangible assets was approximately 0.9 years and 1.4 years , respectively. As of September 30, 2017 , future amortization of acquisition-related intangibles that will be recorded in the Condensed Consolidated Statement of Operations is estimated as follows (in millions): Fiscal Year Ending March 31, 2018 (remaining six months) $ 3 2019 2 Total $ 5

Royalties And Licenses

Royalties And Licenses	6 Months Ended
	Sep. 30, 2017
Royalties And Licenses [Abstract]
Royalties And Licenses	(7) ROYALTIES AND LICENSES Our royalty expenses consist of payments to (1) content licensors, (2) independent software developers, and (3) co-publishing and distribution affiliates. License royalties consist of payments made to celebrities, professional sports organizations, movie studios and other organizations for our use of their trademarks, copyrights, personal publicity rights, content and/or other intellectual property. Royalty payments to independent software developers are payments for the development of intellectual property related to our games. Co-publishing and distribution royalties are payments made to third parties for the delivery of products. Royalty-based obligations with content licensors and distribution affiliates are either paid in advance and capitalized as prepaid royalties or are accrued as incurred and subsequently paid. These royalty-based obligations are generally expensed to cost of revenue at the greater of the contractual rate or an effective royalty rate based on the total projected net revenue for contracts with guaranteed minimums. Prepayments made to thinly capitalized independent software developers and co-publishing affiliates are generally made in connection with the development of a particular product, and therefore, we are generally subject to development risk prior to the release of the product. Accordingly, payments that are due prior to completion of a product are generally expensed to research and development over the development period as the services are incurred. Payments due after completion of the product (primarily royalty-based in nature) are generally expensed as cost of revenue. Our contracts with some licensors include minimum guaranteed royalty payments, which are initially recorded as an asset and as a liability at the contractual amount when no performance remains with the licensor. When performance remains with the licensor, we record guarantee payments as an asset when actually paid and as a liability when incurred, rather than recording the asset and liability upon execution of the contract. Each quarter, we also evaluate the expected future realization of our royalty-based assets, as well as any unrecognized minimum commitments not yet paid to determine amounts we deem unlikely to be realized through product and service sales. Any impairments or losses determined before the launch of a product are generally charged to research and development expense. Impairments or losses determined post-launch are charged to cost of revenue. We evaluate long-lived royalty-based assets for impairment using undiscounted cash flows when impairment indicators exist. If an impairment exists, then the assets are written down to fair value. Unrecognized minimum royalty-based commitments are accounted for as executory contracts, and therefore, any losses on these commitments are recognized when the underlying intellectual property is abandoned ( i.e. , cease use) or the contractual rights to use the intellectual property are terminated. During the three and six months ended September 30, 2017 and 2016 , we did not recognize any material losses or impairment charges on royalty-based commitments. The current and long-term portions of prepaid royalties and minimum guaranteed royalty-related assets, included in other current assets and other assets, consisted of (in millions): As of As of Other current assets $ 47 $ 79 Other assets 38 39 Royalty-related assets $ 85 $ 118 At any given time, depending on the timing of our payments to our co-publishing and/or distribution affiliates, content licensors, and/or independent software developers, we classify any recognized unpaid royalty amounts due to these parties as accrued liabilities. The current and long-term portions of accrued royalties, included in accrued and other current liabilities and other liabilities, consisted of (in millions): As of As of Accrued royalties $ 183 $ 165 Other liabilities 85 97 Royalty-related liabilities $ 268 $ 262 As of September 30, 2017 , we were committed to pay approximately $1,061 million to content licensors, independent software developers, and co-publishing and/or distribution affiliates, but performance remained with the counterparty ( i.e. , delivery of the product or content or other factors) and such commitments were therefore not recorded in our Condensed Consolidated Financial Statements. See Note 11 for further information on our developer and licensor commitments.

Balance Sheet Details

Balance Sheet Details	6 Months Ended
	Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Details	(8) BALANCE SHEET DETAILS Property and Equipment, Net Property and equipment, net, as of September 30, 2017 and March 31, 2017 consisted of (in millions): As of As of Computer, equipment and software $ 726 $ 723 Buildings 327 316 Leasehold improvements 136 126 Equipment, furniture and fixtures, and other 80 82 Land 61 61 Construction in progress 6 7 1,336 1,315 Less: accumulated depreciation (892 ) (881 ) Property and equipment, net $ 444 $ 434 During the three and six months ended September 30, 2017 , depreciation expense associated with property and equipment was $30 million and $59 million , respectively. During the three and six months ended September 30, 2016 , depreciation expense associated with property and equipment was $28 million and $57 million , respectively. Accrued and Other Current Liabilities Accrued and other current liabilities as of September 30, 2017 and March 31, 2017 consisted of (in millions): As of As of Other accrued expenses $ 374 $ 210 Accrued compensation and benefits 186 267 Accrued royalties 183 165 Deferred net revenue (other) 226 147 Accrued and other current liabilities $ 969 $ 789 Deferred net revenue (other) includes the deferral of subscription revenue, advertising revenue, licensing arrangements, and other revenue for which revenue recognition criteria has not been met. Deferred Net Revenue (Online-Enabled Games) Deferred net revenue (online-enabled games) was $1,116 million and $1,539 million as of September 30, 2017 and March 31, 2017 , respectively. Deferred net revenue (online-enabled games) generally includes the unrecognized revenue from bundled sales of online-enabled games for which we do not have VSOE for the obligation to provide unspecified updates. We recognize revenue from the sale of online-enabled games for which we do not have vendor-specific objective evidence of fair value (“VSOE”) for the unspecified updates on a straight-line basis, generally over an estimated nine-month period beginning in the month after shipment for physical games sold through retail and an estimated six-month period for digitally-distributed games. However, we expense the cost of revenue related to these transactions generally during the period in which the product is delivered (rather than on a deferred basis).

Income Taxes

Income Taxes	6 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	(9) INCOME TAXES The provision for income taxes for the three and six months ended September 30, 2017 is based on our projected annual effective tax rate for fiscal year 2018 , adjusted for specific items that are required to be recognized in the period in which they are incurred. Our effective tax rate for the three and six months ended September 30, 2017 was 42.1 percent and 12.5 percent , respectively, as compared to 26.9 percent and 19.6 percent , respectively, for the same period in fiscal year 2017 . The effective tax rate for the three and six months ended September 30, 2017 , as compared to the three and six months ended September 30, 2016, benefited primarily due to the impact of the adoption of ASU 2016-09, which required us to recognize during the three and six months ended September 30, 2017 , $3 million and $42 million , respectively, of excess tax benefits as a component of the provision for income taxes (previously excess tax benefits and tax deficiencies were recognized in additional paid-in-capital). Although the $3 million of excess tax benefits for the three months ended September 30, 2017 reduced tax expense, the effective tax rate for the three months ended September 30, 2017 increased due to the pre-tax book loss for the three months ended September 30, 2017. When compared to the statutory rate of 35.0 percent , the effective tax rate for the three and six months ended September 30, 2017 benefited primarily due to earnings realized in countries that have lower statutory tax rates and the recognition of excess tax benefits from stock-based compensation. We anticipate that the impact of excess tax benefits and tax deficiencies may result in significant fluctuations to our effective tax rate in the future. Excluding excess tax benefits, our effective tax rate would have been 34.2 percent and 18.4 percent , respectively, for the three and six months ended September 30, 2017 . We file income tax returns and are subject to income tax examinations in various jurisdictions with respect to fiscal years after 2008. The timing and potential resolution of income tax examinations is highly uncertain. While we continue to measure our uncertain tax positions, the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued. It is reasonably possible that a reduction of up to $55 million of unrecognized tax benefits may occur within the next 12 months, a portion of which would impact our effective tax rate. The actual amount could vary significantly depending on the ultimate timing and nature of any settlements.

Financing Arrangement

Financing Arrangement	6 Months Ended
	Sep. 30, 2017
Debt Instruments [Abstract]
Financing Arrangement	(10) FINANCING ARRANGEMENTS Senior Notes In February 2016 , we issued $600 million aggregate principal amount of 3.70% Senior Notes due March 1, 2021 (the “2021 Notes”) and $400 million aggregate principal amount of 4.80% Senior Notes due March 1, 2026 (the “2026 Notes,” and together with the 2021 Notes, the “Senior Notes”). Our proceeds were $989 million , net of discount of $2 million and issuance costs of $9 million . Both the discount and issuance costs are being amortized to interest expense over the respective terms of the 2021 Notes and the 2026 Notes using the effective interest rate method. The effective interest rate is 3.94% for the 2021 Notes and 4.97% for the 2026 Notes. Interest is payable semiannually in arrears, on March 1 and September 1 of each year. The carrying and fair values of the Senior Notes are as follows (in millions): As of As of Senior Notes: 3.70% Senior Notes due 2021 $ 600 $ 600 4.80% Senior Notes due 2026 400 400 Total principal amount $ 1,000 $ 1,000 Unaccreted discount (2 ) (2 ) Unamortized debt issuance costs (7 ) (8 ) Net carrying value of Senior Notes $ 991 $ 990 Fair value of Senior Notes (Level 2) $ 1,069 $ 1,054 As of September 30, 2017 , the remaining life of the 2021 Notes and 2026 Notes is approximately 3.4 years and 8.4 years , respectively. The Senior Notes are senior unsecured obligations and rank equally with all our other existing and future unsubordinated obligations and any indebtedness that we may incur from time to time under our Credit Facility. The 2021 Notes and the 2026 Notes are redeemable at our option at any time prior to February 1, 2021 or December 1, 2025, respectively, subject to a make-whole premium. Within one and three months of maturity, we may redeem the 2021 Notes or the 2026 Notes, respectively, at a redemption price equal to 100% of the aggregate principal amount plus accrued and unpaid interest. In addition, upon the occurrence of a change of control repurchase event, the holders of the Senior Notes may require us to repurchase all or a portion of the Senior Notes, at a price equal to 101% of their principal amount, plus accrued and unpaid interest to the date of repurchase. The Senior Notes also include covenants that limit our ability to incur liens on assets and to enter into sale and leaseback transactions, subject to certain allowances. Credit Facility In March 2015 , we entered into a $500 million senior unsecured revolving credit facility (“Credit Facility”) with a syndicate of banks. The Credit Facility terminates on March 19, 2020 . The Credit Facility contains an option to arrange with existing lenders and/or new lenders to provide up to an aggregate of $250 million in additional commitments for revolving loans. Proceeds of loans made under the Credit Facility may be used for general corporate purposes. The loans bear interest, at our option, at the base rate plus an applicable spread or an adjusted LIBOR rate plus an applicable spread, in each case with such spread being determined based on our consolidated leverage ratio for the preceding fiscal quarter. We are also obligated to pay other customary fees for a credit facility of this size and type. Interest is due and payable in arrears quarterly for loans bearing interest at the base rate and at the end of an interest period (or at each three month interval in the case of loans with interest periods greater than three months) in the case of loans bearing interest at the adjusted LIBOR rate. Principal, together with all accrued and unpaid interest, is due and payable on March 19, 2020 . The credit agreement contains customary affirmative and negative covenants, including covenants that limit or restrict our ability to, among other things, incur subsidiary indebtedness, grant liens, dispose of all or substantially all assets and pay dividends or make distributions, in each case subject to customary exceptions for a credit facility of this size and type. We are also required to maintain compliance with a capitalization ratio and maintain a minimum level of total liquidity. The credit agreement contains customary events of default, including among others, non-payment defaults, covenant defaults, cross-defaults to material indebtedness, bankruptcy and insolvency defaults, material judgment defaults and a change of control default, in each case, subject to customary exceptions for a credit facility of this size and type. The occurrence of an event of default could result in the acceleration of the obligations under the credit facility, an obligation by any guarantors to repay the obligations in full and an increase in the applicable interest rate. As of September 30, 2017 , no amounts were outstanding under the Credit Facility. $2 million of debt issuance costs that were paid in connection with obtaining this credit facility are being amortized to interest expense over the 5 -year term of the Credit Facility. Interest Expense The following table summarizes our interest expense recognized for the three and six months ended September 30, 2017 and 2016 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions): Three Months Ended Six Months Ended 2017 2016 2017 2016 Amortization of debt discount $ — $ (1 ) $ — $ (2 ) Amortization of debt issuance costs — — (1 ) (1 ) Coupon interest expense (11 ) (10 ) (21 ) (21 ) Total interest expense $ (11 ) $ (11 ) $ (22 ) $ (24 )

Commitments And Contingencies

Commitments And Contingencies	6 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	(11) COMMITMENTS AND CONTINGENCIES Lease Commitments As of September 30, 2017 , we leased certain facilities, furniture and equipment under non-cancelable operating lease agreements. We were required to pay property taxes, insurance and normal maintenance costs for certain of these facilities and any increases over the base year of these expenses on the remainder of our facilities. Development, Celebrity, League and Content Licenses: Payments and Commitments The products we produce in our studios are designed and created by our employee designers, artists, software programmers and by non-employee software developers (“independent artists” or “third-party developers”). We typically advance development funds to the independent artists and third-party developers during development of our games, usually in installment payments made upon the completion of specified development milestones. Contractually, these payments are generally considered advances against subsequent royalties on the sales of the products. These terms are set forth in written agreements entered into with the independent artists and third-party developers. In addition, we have certain celebrity, league and content license contracts that contain minimum guarantee payments and marketing commitments that may not be dependent on any deliverables. Celebrities and organizations with whom we have contracts include, but are not limited to: FIFA (Fédération Internationale de Football Association), FIFPRO Foundation, FAPL (Football Association Premier League Limited), and DFL Deutsche Fußball Liga E.V. (German Soccer League) (professional soccer); Dr. Ing. h.c. F. Porsche AG, Ferrari S.p.A. (Need For Speed and Real Racing games); National Basketball Association (professional basketball); PGA TOUR (professional golf); National Hockey League and NHL Players’ Association (professional hockey); National Football League Properties and PLAYERS Inc. (professional football); Zuffa, LLC (Ultimate Fighting Championship); ESPN (content in EA SPORTS games); Disney Interactive (Star Wars); Fox Digital Entertainment, Inc. (The Simpsons); and Respawn. These developer and content license commitments represent the sum of (1) the cash payments due under non-royalty-bearing licenses and services agreements and (2) the minimum guaranteed payments and advances against royalties due under royalty-bearing licenses and services agreements, the majority of which are conditional upon performance by the counterparty. These minimum guarantee payments and any related marketing commitments are included in the table below. The following table summarizes our minimum contractual obligations as of September 30, 2017 (in millions): Fiscal Years Ending March 31, 2018 (Remaining Total six mos.) 2019 2020 2021 2022 2023 Thereafter Unrecognized commitments Developer/licensor commitments $ 1,061 $ 78 $ 296 $ 243 $ 206 $ 194 $ 43 $ 1 Marketing commitments 422 26 115 103 77 74 27 — Operating leases 231 18 41 37 37 30 22 46 Senior Notes interest 237 17 41 41 41 20 19 58 Other purchase obligations 97 14 28 22 10 5 4 14 Total unrecognized commitments 2,048 153 521 446 371 323 115 119 Recognized commitments Senior Notes principal and interest 1,003 3 — — 600 — — 400 Licensing obligations 114 12 24 25 26 27 — — Total recognized commitments 1,117 15 24 25 626 27 — 400 Total commitments $ 3,165 $ 168 $ 545 $ 471 $ 997 $ 350 $ 115 $ 519 The unrecognized amounts represented in the table above reflect our minimum cash obligations for the respective fiscal years, but do not necessarily represent the periods in which they will be recognized and expensed in our Condensed Consolidated Financial Statements. In addition, the amounts in the table above are presented based on the dates the amounts are contractually due as of September 30, 2017 ; however, certain payment obligations may be accelerated depending on the performance of our operating results. Furthermore, up to $32 million of the unrecognized amounts in the table above may be payable, at the licensor’s election, in shares of our common stock, subject to a $10 million maximum during any fiscal year. The number of shares to be issued will be based on their fair market value at the time of issuance. In addition to what is included in the table above, as of September 30, 2017 , we had a liability for unrecognized tax benefits and an accrual for the payment of related interest totaling $122 million , of which we are unable to make a reasonably reliable estimate of when cash settlement with a taxing authority will occur. Legal Proceedings On July 29, 2010, Michael Davis, a former NFL running back, filed a putative class action in the United States District Court for the Northern District of California against the Company, alleging that certain past versions of Madden NFL included the images of certain retired NFL players without their permission. In March 2012, the trial court denied the Company’s request to dismiss the complaint on First Amendment grounds. In January 2015, that trial court decision was affirmed by the Ninth Circuit Court of Appeals and the case was remanded back to the United States District Court for the Northern District of California, where the case is pending. We are also subject to claims and litigation arising in the ordinary course of business. We do not believe that any liability from any reasonably foreseeable disposition of such claims and litigation, individually or in the aggregate, would have a material adverse effect on our Condensed Consolidated Financial Statements.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Sep. 30, 2017
Share-based Compensation [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	(12) STOCK-BASED COMPENSATION Valuation Assumptions We estimate the fair value of stock-based awards on the date of grant. We recognize compensation costs for stock-based awards to employees based on the grant-date fair value using a straight-line approach over the service period for which such awards are expected to vest. The determination of the fair value of market-based restricted stock units, stock options and ESPP purchase rights is affected by assumptions regarding subjective and complex variables. Generally, our assumptions are based on historical information and judgment is required to determine if historical trends may be indicators of future outcomes. We determine the fair value of our stock-based awards as follows: • Restricted Stock Units and Performance-Based Restricted Stock Units . The fair value of restricted stock units and performance-based restricted stock units (other than market-based restricted stock units) is determined based on the quoted market price of our common stock on the date of grant. • Market-Based Restricted Stock Units . Market-based restricted stock units consist of grants of performance-based restricted stock units to certain members of executive management that vest contingent upon the achievement of pre-determined market and service conditions (referred to herein as “market-based restricted stock units”). The fair value of our market-based restricted stock units is determined using a Monte-Carlo simulation model. Key assumptions for the Monte-Carlo simulation model are the risk-free interest rate, expected volatility, expected dividends and correlation coefficient. • Stock Options and Employee Stock Purchase Plan . The fair value of stock options and stock purchase rights granted pursuant to our equity incentive plans and our 2000 Employee Stock Purchase Plan, as amended (“ESPP”), respectively, is determined using the Black-Scholes valuation model based on the multiple-award valuation method. Key assumptions of the Black-Scholes valuation model are the risk-free interest rate, expected volatility, expected term and expected dividends. The risk-free interest rate is based on U.S. Treasury yields in effect at the time of grant for the expected term of the option. Expected volatility is based on a combination of historical stock price volatility and implied volatility of publicly-traded options on our common stock. Expected term is determined based on historical exercise behavior, post-vesting termination patterns, options outstanding and future expected exercise behavior. There were an insignificant number of stock options granted during the three and six months ended September 30, 2017 and 2016 . The estimated assumptions used in the Black-Scholes valuation model to value our ESPP purchase rights were as follows: ESPP Purchase Rights Three Months Ended 2017 2016 Risk-free interest rate 1.13 - 1.24% 0.5 - 0.6% Expected volatility 28 % 29 - 32% Weighted-average volatility 28 % 31 % Expected term 6 - 12 months 6 - 12 months Expected dividends None None There were no market-based restricted stock units granted during the three months ended September 30, 2017 and 2016. Stock-Based Compensation Expense Employee stock-based compensation expense recognized during the three and six months ended September 30, 2016 was calculated based on awards ultimately expected to vest and was reduced for estimated forfeitures. We adopted ASU 2016-09 at the beginning of fiscal year 2018 and elected to account for forfeitures as they occur. The adoption resulted in a cumulative-effect adjustment of $8 million , net of tax, decrease to retained earnings. The following table summarizes stock-based compensation expense resulting from stock options, restricted stock units, market-based restricted stock units, performance-based restricted stock units, and the ESPP purchase rights included in our Condensed Consolidated Statements of Operations (in millions): Three Months Ended Six Months Ended 2017 2016 2017 2016 Cost of revenue $ 1 $ 1 $ 2 $ 2 Research and development 36 27 64 54 Marketing and sales 9 8 16 15 General and administrative 16 12 28 25 Stock-based compensation expense $ 62 $ 48 $ 110 $ 96 During the three months ended September 30, 2017 , we recognized a $12 million deferred income tax benefit related to our stock-based compensation expense. During the three months ended September 30, 2016 , we recognized a $9 million deferred income tax benefit related to our stock-based compensation expense. During the six months ended September 30, 2017 , we recognized a $22 million deferred income tax benefit related to our stock-based compensation expense. During the six months ended September 30, 2016 , we recognized an $18 million deferred income tax benefit related to our stock-based compensation expense. As of September 30, 2017 , our total unrecognized compensation cost related to restricted stock units, market-based restricted stock units, performance-based restricted stock units, and stock options was $429 million and is expected to be recognized over a weighted-average service period of 2.0 years . Of the $429 million of unrecognized compensation cost, $320 million relates to restricted stock units, $67 million relates to market-based restricted stock units, $41 million relates to performance-based restricted stock units at target, and $1 million relates to stock options. Stock Options The following table summarizes our stock option activity for the six months ended September 30, 2017 : Options (in thousands) Weighted- Average Exercise Prices Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in millions) Outstanding as of March 31, 2017 2,377 $ 33.35 Granted 2 105.99 Exercised (744 ) 40.47 Forfeited, cancelled or expired (2 ) 46.31 Outstanding as of September 30, 2017 1,633 $ 30.19 5.91 $ 143 Vested and expected to vest 1,633 $ 30.19 5.91 $ 143 Exercisable as of September 30, 2017 1,553 $ 30.40 5.90 $ 136 The aggregate intrinsic value represents the total pre-tax intrinsic value based on our closing stock price as of September 30, 2017 , which would have been received by the option holders had all the option holders exercised their options as of that date. We issue new common stock from our authorized shares upon the exercise of stock options. Restricted Stock Units The following table summarizes our restricted stock unit activity for the six months ended September 30, 2017 : Restricted Stock Rights (in thousands) Weighted- Average Grant Date Fair Values Outstanding as of March 31, 2017 5,153 $ 65.03 Granted 1,881 110.72 Vested (2,158 ) 110.98 Forfeited or cancelled (244 ) 74.73 Outstanding as of September 30, 2017 4,632 $ 61.67 Performance-Based Restricted Stock Units Our performance-based restricted stock units cliff vest after a four-year performance period contingent upon the achievement of pre-determined performance-based milestones and service conditions. If these performance-based milestones are not met but service conditions are met, the performance-based restricted stock units will not vest, in which case any compensation expense we have recognized to date will be reversed. Each quarter, we update our assessment of the probability that the specified performance criteria will be achieved. We amortize the fair values of performance-based restricted stock units over the requisite service period. The number of shares of common stock to be issued at vesting will range from zero percent to 200 percent of the target number of performance-based restricted stock units attributable to each performance-based milestone. The following table summarizes our performance-based restricted stock unit activity, presented with the maximum number of shares that could potentially vest, for the six months ended September 30, 2017 : Performance- Weighted- Average Grant Date Fair Value Outstanding as of March 31, 2017 — $ — Granted 796 110.51 Forfeited or cancelled — — Outstanding as of September 30, 2017 796 $ 110.51 Market-Based Restricted Stock Units Our market-based restricted stock units vest contingent upon the achievement of pre-determined market and service conditions. If these market conditions are not met but service conditions are met, the market-based restricted stock units will not vest; however, any compensation expense we have recognized to date will not be reversed. The number of shares of common stock to be issued at vesting will range from zero percent to 200 percent of the target number of market-based restricted stock units based on our total stockholder return (“TSR”) relative to the performance of companies in the NASDAQ-100 Index for each measurement period, generally over either a one-year, two-year cumulative and three-year cumulative period, or over a two-year and four-year cumulative period. The following table summarizes our market-based restricted stock unit activity, presented with the maximum number of shares that could potentially vest, for the six months ended September 30, 2017 : Market-Based Restricted Stock Units (in thousands) Weighted- Average Grant Date Fair Value Outstanding as of March 31, 2017 1,282 $ 87.37 Granted 706 140.93 Vested (430 ) 76.27 Forfeited or cancelled (216 ) 91.88 Outstanding as of September 30, 2017 1,342 $ 118.35 Stock Repurchase Program In May 2015, our Board of Directors authorized a program to repurchase up to $1 billion of our common stock. We repurchased approximately 0.3 million shares for approximately $31 million under this program during the three months ended June 30, 2017. We completed repurchases under the May 2015 program in April 2017. In May 2017, a Special Committee of our Board of Directors, on behalf of the full Board of Directors, authorized a program to repurchase up to $1.2 billion of our common stock. This stock repurchase program expires on May 31, 2019. Under this program, we may purchase stock in the open market or through privately-negotiated transactions in accordance with applicable securities laws, including pursuant to pre-arranged stock trading plans. The timing and actual amount of the stock repurchases will depend on several factors including price, capital availability, regulatory requirements, alternative investment opportunities and other market conditions. We are not obligated to repurchase a specific number of shares under this program and it may be modified, suspended or discontinued at any time. During the three and six months ended September 30, 2017 , we repurchased approximately 1.3 million and 2.4 million shares for approximately $153 million and $272 million , respectively, under this program. We are actively repurchasing shares under this program. The following table summarizes total shares repurchased during the three and six months ended September 30, 2017 and 2016 : May 2015 Program May 2017 Program Total (in millions) Shares Amount Shares Amount Shares Amount Three months ended September 30, 2017 — $ — 1.3 $ 153 1.3 $ 153 Six months ended September 30, 2017 0.3 $ 31 2.4 $ 272 2.7 $ 303 Three months ended September 30, 2016 1.6 $ 127 — $ — 1.6 $ 127 Six months ended September 30, 2016 3.5 $ 256 — $ — 3.5 $ 256

Earnings (Loss) Per Share

Earnings (Loss) Per Share	6 Months Ended
	Sep. 30, 2017
Earnings Per Share Reconciliation [Abstract]
Earnings (Loss) Per Share	(13) EARNINGS (LOSS) PER SHARE The following table summarizes the computations of basic earnings per share (“Basic EPS”) and diluted earnings per share (“Diluted EPS”). Basic EPS is computed as net income divided by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from common shares issuable through stock-based compensation plans including stock options, restricted stock, restricted stock units, ESPP purchase rights, warrants, and other convertible securities using the treasury stock method. Three Months Ended September 30, Six Months Ended September 30, (In millions, except per share amounts) 2017 2016 2017 2016 Net income (loss) $ (22 ) $ (38 ) $ 622 $ 402 Shares used to compute earnings (loss) per share: Weighted-average common stock outstanding — basic 309 301 309 301 Dilutive potential common shares related to stock award plans and from assumed exercise of stock options — — 4 3 Dilutive potential common shares related to the Convertible Notes (a) — — — 2 Dilutive potential common shares related to the Warrants (a) — — — 9 Weighted-average common stock outstanding — diluted 309 301 313 315 Earnings (loss) per share: Basic $ (0.07 ) $ (0.13 ) $ 2.01 $ 1.34 Diluted $ (0.07 ) $ (0.13 ) $ 1.99 $ 1.28 As a result of our net loss for the three months ended September 30, 2017, we have excluded all potentially dilutive common shares from the diluted loss per share calculation as their inclusion would have had an antidilutive effect. Had we reported net income for this period, an additional 3 million shares of common stock related to our outstanding equity-based instruments would have been included in the number of shares used to calculate Diluted EPS for the three months ended September 30, 2017. As a result of our net loss for the three months ended September 30, 2016, we have excluded all potentially dilutive common shares from the diluted loss per share calculation as their inclusion would have had an antidilutive effect. Had we reported net income for this period, an additional 3 million shares of common stock related to our outstanding equity-based instruments and an additional 10 million shares related to the Warrants would have been included in the number of shares used to calculate Diluted EPS for the three months ended September 30, 2016. For the six months ended September 30, 2017 and 2016 , an immaterial amount of stock options, restricted stock units and market-based restricted stock units were excluded from the treasury stock method computation of diluted shares as their inclusion would have had an antidilutive effect. Our performance-based restricted stock units, which are considered contingently issuable shares, are also excluded from the treasury stock method computation because the related performance-based milestones were not achieved as of the end of the reporting period. (a) See Note 10 - Financing Arrangements in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017 , for additional information regarding the potential dilutive shares related to our Convertible Notes and Warrants.

Description Of Business And B20

Description Of Business And Basis Of Presentation New Accounting Pronouncements or Change in Accounting Principle (Tables)	6 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Accounting Standard Cash Flow Reclassification [Table Text Block]	Six months ended September 30, (In millions): 2017 2016 Excess tax benefit from stock-based compensation $ 42 $ 37 Cash paid to taxing authorities for shares withheld from employees 105 106 Increase to net cash provided by operating activities and net cash used in financing activities $ 147 $ 143

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Assets And Liabilities Measured On Recurring Basis	Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Financial Instruments Significant Other Observable Inputs Significant Unobservable Inputs As of (Level 1) (Level 2) (Level 3) Balance Sheet Classification Assets Bank and time deposits $ 304 $ 304 $ — $ — Cash equivalents Money market funds 93 93 — — Cash equivalents Available-for-sale securities: Corporate bonds 1,247 — 1,247 — Short-term investments and cash equivalents U.S. Treasury securities 453 453 — — Short-term investments and cash equivalents U.S. agency securities 133 — 133 — Short-term investments and cash equivalents Commercial paper 320 — 320 — Short-term investments and cash equivalents Foreign government securities 101 — 101 — Short-term investments Asset-backed securities 119 — 119 — Short-term investments Certificates of deposit 26 — 26 — Short-term investments Foreign currency derivatives 9 — 9 — Other current assets and other assets Deferred compensation plan assets (a) 10 10 — — Other assets Total assets at fair value $ 2,815 $ 860 $ 1,955 $ — Liabilities Foreign currency derivatives 48 — 48 — Accrued and other current liabilities and other liabilities Deferred compensation plan liabilities (a) 10 10 — — Other liabilities Total liabilities at fair value $ 58 $ 10 $ 48 $ — Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Financial Instruments Significant Other Observable Inputs Significant Unobservable Inputs As of (Level 1) (Level 2) (Level 3) Balance Sheet Classification Assets Bank and time deposits $ 233 $ 233 $ — $ — Cash equivalents Money market funds 405 405 — — Cash equivalents Available-for-sale securities: Corporate bonds 963 — 963 — Short-term investments and cash equivalents U.S. Treasury securities 460 460 — — Short-term investments and cash equivalents U.S. agency securities 172 — 172 — Short-term investments and cash equivalents Commercial paper 270 — 270 — Short-term investments and cash equivalents Foreign government securities 113 — 113 — Short-term investments Asset-backed securities 135 — 135 — Short-term investments Foreign currency derivatives 19 — 19 — Other current assets and other assets Deferred compensation plan assets (a) 8 8 — — Other assets Total assets at fair value $ 2,778 $ 1,106 $ 1,672 $ — Liabilities Foreign currency derivatives 8 — 8 — Accrued and other current liabilities and other liabilities Deferred compensation plan liabilities (a) 9 9 — — Other liabilities Total liabilities at fair value $ 17 $ 9 $ 8 $ —

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Sep. 30, 2017
Financial Instruments [Abstract]
Fair Value Of Short-Term Investments	Short-term investments consisted of the following as of September 30, 2017 and March 31, 2017 (in millions): As of September 30, 2017 As of March 31, 2017 Cost or Amortized Cost Gross Unrealized Fair Value Cost or Amortized Cost Gross Unrealized Fair Value Gains Losses Gains Losses Corporate bonds $ 1,235 $ — $ (1 ) $ 1,234 $ 944 $ — $ (1 ) $ 943 U.S. Treasury securities 410 — (1 ) 409 414 — (1 ) 413 U.S. agency securities 132 — (1 ) 131 152 — (1 ) 151 Commercial paper 268 — — 268 212 — — 212 Foreign government securities 101 — — 101 113 — — 113 Asset-backed securities 119 — — 119 135 — — 135 Certificates of deposit 26 — — 26 — — — — Short-term investments $ 2,291 $ — $ (3 ) $ 2,288 $ 1,970 $ — $ (3 ) $ 1,967
Fair Value Of Short-Term Investments By Stated Maturity Date Schedule	The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of September 30, 2017 and March 31, 2017 (in millions): As of September 30, 2017 As of March 31, 2017 Amortized Cost Fair Value Amortized Cost Fair Value Short-term investments Due within 1 year $ 1,592 $ 1,591 $ 1,237 $ 1,236 Due 1 year through 5 years 696 694 721 719 Due after 5 years 3 3 12 12 Short-term investments $ 2,291 $ 2,288 $ 1,970 $ 1,967

Derivative Financial Instrume23

Derivative Financial Instruments (Tables)	6 Months Ended
	Sep. 30, 2017
Derivative Financial Instruments [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	Total gross notional amounts and fair values for currency derivatives with cash flow hedge accounting designation are as follows (in millions): As of September 30, 2017 As of March 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Asset Liability Asset Liability Forward contracts to purchase $ 167 $ 8 $ — $ 185 $ — $ 5 Forward contracts to sell $ 1,146 $ 1 $ 48 $ 840 $ 19 $ 3
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	Total gross notional amounts and fair values for currency derivatives that are not designated as hedging instruments are accounted for as follows (in millions): As of September 30, 2017 As of March 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Asset Liability Asset Liability Forward contracts to purchase $ 139 $ — $ — $ 87 $ — $ — Forward contracts to sell $ 425 $ — $ — $ 166 $ — $ — The effect of foreign currency forward contracts not designated as hedging instruments in our Condensed Consolidated Statements of Operations for the three and six months ended September 30, 2017 and 2016 , was as follows (in millions): Statement of Operations Classification Amount of Gain (Loss) Recognized in the Statement of Operations Three Months Ended Six Months Ended 2017 2016 2017 2016 Foreign currency forward contracts not designated as hedging instruments Interest and other income (expense), net $ (3 ) $ 3 $ (9 ) $ 1

Accumulated Other Comprehensi24

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended September 30, 2017 and 2016 are as follows (in millions): Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of June 30, 2017 $ (3 ) $ (24 ) $ (44 ) $ (71 ) Other comprehensive income (loss) before reclassifications — (29 ) 32 3 Amounts reclassified from accumulated other comprehensive income (loss) — (5 ) — (5 ) Total other comprehensive income (loss), net of tax — (34 ) 32 (2 ) Balance as of September 30, 2017 $ (3 ) $ (58 ) $ (12 ) $ (73 ) Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of June 30, 2016 $ 3 $ 36 $ (36 ) $ 3 Other comprehensive income (loss) before reclassifications (1 ) (1 ) (6 ) (8 ) Amounts reclassified from accumulated other comprehensive income (loss) (1 ) (4 ) — (5 ) Total other comprehensive income (loss), net of tax (2 ) (5 ) (6 ) (13 ) Balance as of September 30, 2016 $ 1 $ 31 $ (42 ) $ (10 ) The changes in accumulated other comprehensive income (loss) by component, net of tax, for the six months ended September 30, 2017 and 2016 are as follows (in millions): Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of March 31, 2017 $ (3 ) $ 32 $ (48 ) $ (19 ) Other comprehensive income (loss) before reclassifications — (68 ) 46 (22 ) Amounts reclassified from accumulated other comprehensive income (loss) — (22 ) (10 ) (32 ) Total other comprehensive income (loss), net of tax — (90 ) 36 (54 ) Balance as of September 30, 2017 $ (3 ) $ (58 ) $ (12 ) $ (73 ) Unrealized Net Gains (Losses) on Available-for-Sale Securities Unrealized Net Gains (Losses) on Derivative Instruments Foreign Currency Translation Adjustments Total Balances as of March 31, 2016 $ 1 $ 14 $ (31 ) $ (16 ) Other comprehensive income (loss) before reclassifications 1 27 (11 ) 17 Amounts reclassified from accumulated other comprehensive income (loss) (1 ) (10 ) — (11 ) Total other comprehensive income (loss), net of tax — 17 (11 ) 6 Balance as of September 30, 2016 $ 1 $ 31 $ (42 ) $ (10 )
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The effects on net income of amounts reclassified from accumulated other comprehensive income (loss) for the three and six months ended September 30, 2017 were as follows (in millions): Amount Reclassified From Accumulated Other Comprehensive Income (Loss) Statement of Operations Classification Three Months Ended Six Months Ended (Gains) losses on cash flow hedges from forward contracts Net revenue $ (3 ) $ (22 ) Research and development (2 ) — Total, net of tax $ (5 ) $ (22 ) (Gains) losses on foreign currency translation Interest and other income (expense), net $ — $ (10 ) Total, net of tax $ — $ (10 ) Total net (gain) loss reclassified, net of tax $ (5 ) $ (32 ) The effects on net income of amounts reclassified from accumulated other comprehensive income (loss) for the three and six months ended September 30, 2016 were as follows (in millions): Amount Reclassified From Accumulated Other Comprehensive Income (Loss) Statement of Operations Classification Three Months Ended Six Months Ended (Gains) losses on available-for-sale securities Interest and other income (expense), net $ (1 ) $ (1 ) Total, net of tax $ (1 ) $ (1 ) (Gains) losses on cash flow hedges from forward contracts Net revenue $ (4 ) $ (9 ) Research and development — (1 ) Total, net of tax $ (4 ) $ (10 ) Total net (gain) loss reclassified, net of tax $ (5 ) $ (11 )

Goodwill And Acquisition-Rela25

Goodwill And Acquisition-Related Intangibles, Net (Tables)	6 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Changes In The Carrying Amount Of Goodwill	The changes in the carrying amount of goodwill for the six months ended September 30, 2017 are as follows (in millions): As of Activity Effects of Foreign Currency Translation As of Goodwill $ 2,075 $ — $ 4 $ 2,079 Accumulated impairment (368 ) — — (368 ) Total $ 1,707 $ — $ 4 $ 1,711
Schedule Of Acquisition-Related Intangibles	Acquisition-related intangibles consisted of the following (in millions): As of September 30, 2017 As of March 31, 2017 Gross Carrying Amount Accumulated Amortization Acquisition- Related Intangibles, Net Gross Carrying Amount Accumulated Amortization Acquisition- Related Intangibles, Net Developed and core technology $ 412 $ (412 ) $ — $ 412 $ (412 ) $ — Trade names and trademarks 106 (101 ) 5 106 (98 ) 8 Registered user base and other intangibles 5 (5 ) — 5 (5 ) — Carrier contracts and related 85 (85 ) — 85 (85 ) — Total $ 608 $ (603 ) $ 5 $ 608 $ (600 ) $ 8
Schedule Of Amoritization Of Intangibles	Amortization of intangibles for the three and six months ended September 30, 2017 and 2016 are classified in the Condensed Consolidated Statement of Operations as follows (in millions): Three Months Ended Six Months Ended 2017 2016 2017 2016 Cost of service and other $ — $ 8 $ — $ 16 Cost of product — 4 — 9 Operating expenses 2 1 3 3 Total $ 2 $ 13 $ 3 $ 28
Schedule Of Future Amortization Of Acquisition-Related Intangibles	As of September 30, 2017 , future amortization of acquisition-related intangibles that will be recorded in the Condensed Consolidated Statement of Operations is estimated as follows (in millions): Fiscal Year Ending March 31, 2018 (remaining six months) $ 3 2019 2 Total $ 5

Royalties And Licenses (Tables)

Royalties And Licenses (Tables)	6 Months Ended
	Sep. 30, 2017
Royalties And Licenses [Abstract]
Schedule Of Royalty-Related Assets	The current and long-term portions of prepaid royalties and minimum guaranteed royalty-related assets, included in other current assets and other assets, consisted of (in millions): As of As of Other current assets $ 47 $ 79 Other assets 38 39 Royalty-related assets $ 85 $ 118
Schedule Of Royalty-Related Liabilities	The current and long-term portions of accrued royalties, included in accrued and other current liabilities and other liabilities, consisted of (in millions): As of As of Accrued royalties $ 183 $ 165 Other liabilities 85 97 Royalty-related liabilities $ 268 $ 262

Balance Sheet Details (Tables)

Balance Sheet Details (Tables)	6 Months Ended
	Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Property And Equipment, Net Schedule	Property and equipment, net, as of September 30, 2017 and March 31, 2017 consisted of (in millions): As of As of Computer, equipment and software $ 726 $ 723 Buildings 327 316 Leasehold improvements 136 126 Equipment, furniture and fixtures, and other 80 82 Land 61 61 Construction in progress 6 7 1,336 1,315 Less: accumulated depreciation (892 ) (881 ) Property and equipment, net $ 444 $ 434
Accrued And Other Current Liabilities Schedule	Accrued and other current liabilities as of September 30, 2017 and March 31, 2017 consisted of (in millions): As of As of Other accrued expenses $ 374 $ 210 Accrued compensation and benefits 186 267 Accrued royalties 183 165 Deferred net revenue (other) 226 147 Accrued and other current liabilities $ 969 $ 789

Financing Arrangement (Tables)

Financing Arrangement (Tables)	6 Months Ended
	Sep. 30, 2017
Debt Instruments [Abstract]
Schedule of Carrying Values Of Liability and Equity Components of Senior Notes [Table Text Block]	The carrying and fair values of the Senior Notes are as follows (in millions): As of As of Senior Notes: 3.70% Senior Notes due 2021 $ 600 $ 600 4.80% Senior Notes due 2026 400 400 Total principal amount $ 1,000 $ 1,000 Unaccreted discount (2 ) (2 ) Unamortized debt issuance costs (7 ) (8 ) Net carrying value of Senior Notes $ 991 $ 990 Fair value of Senior Notes (Level 2) $ 1,069 $ 1,054
Schedule Of Interest Expense	The following table summarizes our interest expense recognized for the three and six months ended September 30, 2017 and 2016 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions): Three Months Ended Six Months Ended 2017 2016 2017 2016 Amortization of debt discount $ — $ (1 ) $ — $ (2 ) Amortization of debt issuance costs — — (1 ) (1 ) Coupon interest expense (11 ) (10 ) (21 ) (21 ) Total interest expense $ (11 ) $ (11 ) $ (22 ) $ (24 )

Commitments And Contingencies (

Commitments And Contingencies (Tables)	6 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Minimum Contractual Obligations	The following table summarizes our minimum contractual obligations as of September 30, 2017 (in millions): Fiscal Years Ending March 31, 2018 (Remaining Total six mos.) 2019 2020 2021 2022 2023 Thereafter Unrecognized commitments Developer/licensor commitments $ 1,061 $ 78 $ 296 $ 243 $ 206 $ 194 $ 43 $ 1 Marketing commitments 422 26 115 103 77 74 27 — Operating leases 231 18 41 37 37 30 22 46 Senior Notes interest 237 17 41 41 41 20 19 58 Other purchase obligations 97 14 28 22 10 5 4 14 Total unrecognized commitments 2,048 153 521 446 371 323 115 119 Recognized commitments Senior Notes principal and interest 1,003 3 — — 600 — — 400 Licensing obligations 114 12 24 25 26 27 — — Total recognized commitments 1,117 15 24 25 626 27 — 400 Total commitments $ 3,165 $ 168 $ 545 $ 471 $ 997 $ 350 $ 115 $ 519

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of assumptions used in the Black-Scholes valuation model	ESPP Purchase Rights Three Months Ended 2017 2016 Risk-free interest rate 1.13 - 1.24% 0.5 - 0.6% Expected volatility 28 % 29 - 32% Weighted-average volatility 28 % 31 % Expected term 6 - 12 months 6 - 12 months Expected dividends None None
Schedule Of Stock-Based Compensation Expense By Statement Of Operations	Three Months Ended Six Months Ended 2017 2016 2017 2016 Cost of revenue $ 1 $ 1 $ 2 $ 2 Research and development 36 27 64 54 Marketing and sales 9 8 16 15 General and administrative 16 12 28 25 Stock-based compensation expense $ 62 $ 48 $ 110 $ 96
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award	Options (in thousands) Weighted- Average Exercise Prices Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in millions) Outstanding as of March 31, 2017 2,377 $ 33.35 Granted 2 105.99 Exercised (744 ) 40.47 Forfeited, cancelled or expired (2 ) 46.31 Outstanding as of September 30, 2017 1,633 $ 30.19 5.91 $ 143 Vested and expected to vest 1,633 $ 30.19 5.91 $ 143 Exercisable as of September 30, 2017 1,553 $ 30.40 5.90 $ 136
Restricted Stock Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award	Restricted Stock Rights (in thousands) Weighted- Average Grant Date Fair Values Outstanding as of March 31, 2017 5,153 $ 65.03 Granted 1,881 110.72 Vested (2,158 ) 110.98 Forfeited or cancelled (244 ) 74.73 Outstanding as of September 30, 2017 4,632 $ 61.67
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award	Performance- Weighted- Average Grant Date Fair Value Outstanding as of March 31, 2017 — $ — Granted 796 110.51 Forfeited or cancelled — — Outstanding as of September 30, 2017 796 $ 110.51
Market-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award	Market-Based Restricted Stock Units (in thousands) Weighted- Average Grant Date Fair Value Outstanding as of March 31, 2017 1,282 $ 87.37 Granted 706 140.93 Vested (430 ) 76.27 Forfeited or cancelled (216 ) 91.88 Outstanding as of September 30, 2017 1,342 $ 118.35
Repurchase Program, Total [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award	May 2015 Program May 2017 Program Total (in millions) Shares Amount Shares Amount Shares Amount Three months ended September 30, 2017 — $ — 1.3 $ 153 1.3 $ 153 Six months ended September 30, 2017 0.3 $ 31 2.4 $ 272 2.7 $ 303 Three months ended September 30, 2016 1.6 $ 127 — $ — 1.6 $ 127 Six months ended September 30, 2016 3.5 $ 256 — $ — 3.5 $ 256

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	6 Months Ended
	Sep. 30, 2017
Earnings Per Share Reconciliation [Abstract]
Computation Of Basic Earnings (Loss) And Diluted Earnings (Loss) Per Share	The following table summarizes the computations of basic earnings per share (“Basic EPS”) and diluted earnings per share (“Diluted EPS”). Basic EPS is computed as net income divided by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from common shares issuable through stock-based compensation plans including stock options, restricted stock, restricted stock units, ESPP purchase rights, warrants, and other convertible securities using the treasury stock method. Three Months Ended September 30, Six Months Ended September 30, (In millions, except per share amounts) 2017 2016 2017 2016 Net income (loss) $ (22 ) $ (38 ) $ 622 $ 402 Shares used to compute earnings (loss) per share: Weighted-average common stock outstanding — basic 309 301 309 301 Dilutive potential common shares related to stock award plans and from assumed exercise of stock options — — 4 3 Dilutive potential common shares related to the Convertible Notes (a) — — — 2 Dilutive potential common shares related to the Warrants (a) — — — 9 Weighted-average common stock outstanding — diluted 309 301 313 315 Earnings (loss) per share: Basic $ (0.07 ) $ (0.13 ) $ 2.01 $ 1.34 Diluted $ (0.07 ) $ (0.13 ) $ 1.99 $ 1.28

Description Of Business And B32

Description Of Business And Basis Of Presentation Fiscal Period (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fiscal Period
Current and Prior Years Fiscal Period (in weeks)			52	52
Current and Prior Years Fiscal Quarter Period (in weeks)	13	13	26	26
Minimum
Fiscal Period
Fiscal Year			52
Maximum
Fiscal Period
Fiscal Year			53

Description Of Business And B33

Description Of Business And Basis Of Presentation Description of Business and Basis of Presentation (Impact of Recently Adopted Accounting Standards) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Accounting Standards Update 2016-09 [Member]
Change in Accounting Estimate [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax		$ 8
Increase to net cash provided by Operating Activities [Member]
Change in Accounting Estimate [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities			$ 37
Provision for income taxes [Member] | Increase to net cash provided by Operating Activities [Member]
Change in Accounting Estimate [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 3	$ 42

Description Of Business And B34

Description Of Business And Basis Of Presentation Accounting Standard Cash Flow Reclassification (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash paid to taxing authorities for shares withheld from employees		$ 105	$ 106
Increase to net cash provided by Operating Activities and net cash used in Financing Activities		147	143
Increase to net cash provided by Operating Activities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities			37
Increase to net cash used in Financing Activities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash paid to taxing authorities for shares withheld from employees		105	$ 106
Provision for income taxes [Member] | Increase to net cash provided by Operating Activities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 3	$ 42

(Fair Value Of Assets And Liabi

(Fair Value Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Mar. 31, 2017
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value		$ 2,815	$ 2,778
Total liabilities at fair value		58	17
Quoted Prices In Active Markets For Identical Financial Instruments (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value		860	1,106
Total liabilities at fair value		10	9
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value		1,955	1,672
Total liabilities at fair value		48	8
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value		0	0
Total liabilities at fair value		0	0
Short-term investments | Significant Other Observable Inputs (Level 2) | Foreign Government Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Available-for-sale of securities		101	113
Short-term investments | Significant Other Observable Inputs (Level 2) | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Asset-backed securities		119	135
Short-term investments | Significant Other Observable Inputs (Level 2) | Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Available-for-sale of securities		26
Short-Term Investments And Cash Equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Available-for-sale of securities		453	460
Short-Term Investments And Cash Equivalents | Significant Other Observable Inputs (Level 2) | Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Available-for-sale of securities		1,247	963
Short-Term Investments And Cash Equivalents | Significant Other Observable Inputs (Level 2) | U.S. agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Available-for-sale of securities		133	172
Short-Term Investments And Cash Equivalents | Significant Other Observable Inputs (Level 2) | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Available-for-sale of securities		320	270
Cash Equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Bank Time Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Cash equivalents		304	233
Cash Equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Cash equivalents		93	405
Other Current Assets and Other Assets [Domain] | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Foreign currency derivatives, assets		9	19
Other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Deferred compensation plan assets	[1]	10	8
Accrued and Other Current Liabilities and Other Liabilities | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Foreign currency derivatives, liabilities		48	8
Other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred Compensation Plan Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value, Deferred compensation plan assets	[1]	$ 10	$ 9
[1]	The Deferred Compensation Plan assets consist of various mutual funds. See Note 13 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017, for additional information regarding our Deferred Compensation Plan.

Financial Instruments (Narrativ

Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017		Sep. 30, 2016	Mar. 31, 2016
Financial Instruments
Cash and Cash Equivalents, at Carrying Value	$ 2,067	$ 2,565	[1]	$ 1,746	$ 2,493
[1]	Derived from audited Consolidated Financial Statements.

Financial Instruments (Fair Val

Financial Instruments (Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017
Financial Instruments
Fair Value	$ 2,288	$ 1,967	[1]
Short-term investments
Financial Instruments
Cost or Amortized Cost	2,291	1,970
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	(3)
Fair Value	2,288	1,967
Short-term investments | Corporate bonds
Financial Instruments
Cost or Amortized Cost	1,235	944
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(1)
Fair Value	1,234	943
Short-term investments | U.S. Treasury securities
Financial Instruments
Cost or Amortized Cost	410	414
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(1)
Fair Value	409	413
Short-term investments | U.S. agency securities
Financial Instruments
Cost or Amortized Cost	132	152
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(1)
Fair Value	131	151
Short-term investments | Commercial paper
Financial Instruments
Cost or Amortized Cost	268	212
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	268	212
Short-term investments | Foreign Government Debt Securities [Member]
Financial Instruments
Cost or Amortized Cost	101	113
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	101	113
Short-term investments | Asset-backed Securities [Member]
Financial Instruments
Cost or Amortized Cost	119	135
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	119	135
Short-term investments | Certificates of Deposit [Member]
Financial Instruments
Cost or Amortized Cost	26	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 26	$ 0
[1]	Derived from audited Consolidated Financial Statements.

Financial Instruments (Fair V38

Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Financial Instruments
Short-term investments, Fair Value	$ 2,288	$ 1,967	[1]
Short-term investments
Financial Instruments
Due in 1 year or less, Amortized Cost	1,592	1,237
Due in 1 year or less, Fair Value	1,591	1,236
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	696	721
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	694	719
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	3	12
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	3	12
Short-term investments, Amortized Cost	2,291	1,970
Short-term investments, Fair Value	$ 2,288	$ 1,967
[1]	Derived from audited Consolidated Financial Statements.

Derivative Financial Instrume39

Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cash Flow Hedging [Member]
Derivative
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 5	$ 5	$ 22	$ 11
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness			$ 5
Designated as Hedging Instrument [Member]
Derivative
Maximum Remaining Maturity of Foreign Currency Derivatives			18 months
Not Designated as Hedging Instrument [Member]
Derivative
Maximum Remaining Maturity of Foreign Currency Derivatives			3 months

Derivative Financial Instrume40

Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of foreign currency contracts outstanding, Assets	$ 8	$ 0
Fair value of foreign currency contracts outstanding, Liabilities	0	5
Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of foreign currency contracts outstanding, Assets	1	19
Fair value of foreign currency contracts outstanding, Liabilities	48	3
Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	167	185
Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	1,146	840
United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	139	87
United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	425	166
Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Current	0	0
Derivative Liability, Current	0	0
Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Current	0	0
Derivative Liability, Current	$ 0	$ 0

Location of Income (Expense) Re

Location of Income (Expense) Recognized in Income on Derivative, Non-Designated Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest and Other Income (Expense), net
Derivative
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (3)	$ 3	$ (9)	$ 1

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (71)	$ 3	$ (19)	[1]	$ (16)
Other comprehensive income (loss) before reclassifications	3	(8)	(22)		17
Amounts reclassified from accumulated other comprehensive income (loss)	(5)	(5)	(32)		(11)
Total other comprehensive income (loss), net of tax	(2)	(13)	(54)		6
Ending balance	(73)	(10)	(73)		(10)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3)	3	(3)		1
Other comprehensive income (loss) before reclassifications	0	(1)	0		1
Amounts reclassified from accumulated other comprehensive income (loss)	0	(1)	0		(1)
Total other comprehensive income (loss), net of tax	0	(2)	0		0
Ending balance	(3)	1	(3)		1
Unrealized Gains (Losses) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(24)	36	32		14
Other comprehensive income (loss) before reclassifications	(29)	(1)	(68)		27
Amounts reclassified from accumulated other comprehensive income (loss)	(5)	(4)	(22)		(10)
Total other comprehensive income (loss), net of tax	(34)	(5)	(90)		17
Ending balance	(58)	31	(58)		31
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(44)	(36)	(48)		(31)
Other comprehensive income (loss) before reclassifications	32	(6)	46		(11)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	(10)		0
Total other comprehensive income (loss), net of tax	32	(6)	36		(11)
Ending balance	$ (12)	$ (42)	$ (12)		$ (42)
[1]	Derived from audited Consolidated Financial Statements.

Effects on net income of amount

Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	$ (5)	$ (5)	$ (32)	$ (11)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	0	(1)	0	(1)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Interest Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)		(1)		(1)
Unrealized Gains (Losses) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	(5)	(4)	(22)	(10)
Unrealized Gains (Losses) on Derivative Instruments [Member] | Sales Revenue, Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	(3)	(4)	(22)	(9)
Unrealized Gains (Losses) on Derivative Instruments [Member] | Research And Development [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	0	0	(1)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	0	$ 0	(10)	$ 0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Interest Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	$ 0		$ (10)

Goodwill And Acquisition-Rela44

Goodwill And Acquisition-Related Intangibles, Net (Narrative) (Details)	6 Months Ended	12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017
Minimum
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life	2 years
Maximum
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life	14 years
Weighted Average
Finite-Lived Intangible Assets
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 months	1 year 5 months

Goodwill And Acquisition-Rela45

Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) $ in Millions	6 Months Ended
	Sep. 30, 2017USD ($)
Goodwill [Roll Forward]
Goodwill, Gross, Beginning balance	$ 2,075
Accumulated impairment, beginning balance	(368)
Goodwill, Net, Beginning balance	1,707	[1]
Goodwill acquired	0
Effects of foreign currency translation	4
Goodwill, Gross, Ending balance	2,079
Accumulated impairment, ending balance	(368)
Goodwill, Net, Ending balance	$ 1,711
[1]	Derived from audited Consolidated Financial Statements.

Goodwill And Acquisition-Rela46

Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Finite-Lived Intangible Assets
Gross carrying amount	$ 608	$ 608
Accumulated amortization	(603)	(600)
Acquisition-related intangibles, net	5	8	[1]
Developed And Core Technology
Finite-Lived Intangible Assets
Gross carrying amount	412	412
Accumulated amortization	(412)	(412)
Acquisition-related intangibles, net	0	0
Trade Names And Trademarks
Finite-Lived Intangible Assets
Gross carrying amount	106	106
Accumulated amortization	(101)	(98)
Acquisition-related intangibles, net	5	8
Registered User Base And Other Intangibles
Finite-Lived Intangible Assets
Gross carrying amount	5	5
Accumulated amortization	(5)	(5)
Acquisition-related intangibles, net	0	0
Carrier Contracts And Related
Finite-Lived Intangible Assets
Gross carrying amount	85	85
Accumulated amortization	(85)	(85)
Acquisition-related intangibles, net	$ 0	$ 0
[1]	Derived from audited Consolidated Financial Statements.

Goodwill And Acquisition-Rela47

Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 2	$ 1	$ 3	$ 3
Cost of service and other
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	0	8	0	16
Cost of product
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	0	4	0	9
Operating expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	2	1	3	3
Total amortization
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 2	$ 13	$ 3	$ 28

Goodwill And Acquisition-Rela48

Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Future Amortization Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017	[1]
Goodwill and Intangible Assets Disclosure [Abstract]
2018 (remaining six months)	$ 3
2,019	2
Total	$ 5	$ 8
[1]	Derived from audited Consolidated Financial Statements.

Royalties And Licenses (Narrati

Royalties And Licenses (Narrative) (Details) $ in Millions	Sep. 30, 2017USD ($)
Developer/Licensor Commitments - Royalty Bearing Only
Royalties And Licenses
Unrecorded Unconditional Purchase Obligation	$ 1,061

Royalties And Licenses (Schedul

Royalties And Licenses (Schedule Of Royalty-Related Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Royalties and Licenses
Royalty-related assets	$ 85	$ 118
Other Current Assets
Royalties and Licenses
Royalty-related assets	47	79
Other assets
Royalties and Licenses
Royalty-related assets	$ 38	$ 39

Royalties And Licenses (Sched51

Royalties And Licenses (Schedule Of Royalty-Related Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Royalty Related Liabilities
Royalty-related liabilities	$ 268	$ 262
Accrued royalties
Royalty Related Liabilities
Royalty-related liabilities	183	165
Other liabilities
Royalty Related Liabilities
Royalty-related liabilities	$ 85	$ 97

Balance Sheet Details (Narrativ

Balance Sheet Details (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	[1]
Balance Sheet Related Disclosures [Abstract]
Depreciation expense	$ 30	$ 28	$ 59	$ 57
Deferred Revenue, Current	$ 1,116		$ 1,116		$ 1,539
[1]	Derived from audited Consolidated Financial Statements.

Balance Sheet Details (Property

Balance Sheet Details (Property And Equipment, Net Schedule) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Property and Equipment, Net [Line Items]
Property and equipment, gross	$ 1,336	$ 1,315
Less: accumulated depreciation	(892)	(881)
Property and equipment, net	444	434	[1]
Computer, equipment and software
Property and Equipment, Net [Line Items]
Property and equipment, gross	726	723
Buildings
Property and Equipment, Net [Line Items]
Property and equipment, gross	327	316
Leasehold improvements
Property and Equipment, Net [Line Items]
Property and equipment, gross	136	126
Equipment, furniture and fixtures, and other
Property and Equipment, Net [Line Items]
Property and equipment, gross	80	82
Land
Property and Equipment, Net [Line Items]
Property and equipment, gross	61	61
Construction in progress
Property and Equipment, Net [Line Items]
Property and equipment, gross	$ 6	$ 7
[1]	Derived from audited Consolidated Financial Statements.

Balance Sheet Details (Accrued

Balance Sheet Details (Accrued And Other Current Liabilities Schedule) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Other accrued expenses	$ 374	$ 210
Accrued compensation and benefits	186	267
Accrued royalties	183	165
Deferred net revenue (other)	226	147
Accrued and other current liabilities	$ 969	$ 789	[1]
[1]	Derived from audited Consolidated Financial Statements.

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Footnote Disclosure [Line Items]
Effective tax rates	42.10%	26.90%	12.50%	19.60%
United States statutory tax rate	35.00%		35.00%
Maximum
Income Tax Footnote Disclosure [Line Items]
Amount of unrecognized tax benefits for which it is reasonably possible that there will be a reduction within the next 12 months	$ 55		$ 55
Increase to net cash provided by Operating Activities [Member]
Income Tax Footnote Disclosure [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities				$ 37
Excluding excess tax benefit [Member]
Income Tax Footnote Disclosure [Line Items]
Effective tax rates	34.20%		18.40%
Provision for income taxes [Member] | Increase to net cash provided by Operating Activities [Member]
Income Tax Footnote Disclosure [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 3		$ 42

Financing Arrangement (Senior N

Financing Arrangement (Senior Notes) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Feb. 29, 2016	Sep. 30, 2017	Mar. 31, 2017		Feb. 24, 2016
Debt Instrument [Line Items]
Senior Notes, Noncurrent		$ 991	$ 990	[1]
Proceeds from Issuance of Senior Long-term Debt	$ 989
2021 Notes
Debt Instrument [Line Items]
Effective interest rate					3.94%
Debt Instrument, Convertible, Remaining Discount Amortization Period		3 years 5 months
Long-term Debt					$ 600
Debt Instrument, Interest Rate, Stated Percentage					3.70%
Debt Instrument, Maturity Date	Mar. 1, 2021
2026 Notes
Debt Instrument [Line Items]
Effective interest rate					4.97%
Debt Instrument, Convertible, Remaining Discount Amortization Period		8 years 5 months
Long-term Debt					$ 400
Debt Instrument, Interest Rate, Stated Percentage					4.80%
Debt Instrument, Maturity Date	Mar. 1, 2026
Senior Notes
Debt Instrument [Line Items]
Long-term Debt					$ 1,000
Debt Instrument, Unamortized Discount (Premium), Net		$ (2)	(2)		(2)
Debt Issuance Costs, Noncurrent, Net		(7)	(8)		$ (9)
Debt Instrument, Fair Value Disclosure		$ 1,069	$ 1,054
Senior Notes, Frequency of Periodic Payment	semiannually
Debt Instrument, Redemption Price, Percentage		100.00%
Change of control repurchase event
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.00%
[1]	Derived from audited Consolidated Financial Statements.

Financing Arrangement (Line of

Financing Arrangement (Line of Credit Facility) (Details) - Revolving Credit Facility [Member] $ in Millions	6 Months Ended
	Sep. 30, 2017USD ($)
Line of Credit Facility [Line Items]
Credit Facility, Maximum Borrowing Capacity	$ 500
Option To Request Additional Commitments On Credit Facility	250
Debt issuance costs	$ 2
Credit Facility, Initiation Date	Mar. 19, 2015
Credit Facility, Expiration Date	Mar. 19, 2020
Line of Credit Facility Term	5 years

Financing Arrangement (Schedule

Financing Arrangement (Schedule Of Interest Expense Related To Notes) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt Instruments [Abstract]
Amortization of debt discount	$ 0	$ (1)	$ 0	$ (2)
Amortization of debt issuance costs	0	0	(1)	(1)
Coupon interest expense	(11)	(10)	(21)	(21)
Total interest expense	$ (11)	$ (11)	$ (22)	$ (24)

Commitments And Contingencies59

Commitments And Contingencies (Narrative) (Details) $ in Millions	Sep. 30, 2017USD ($)
Loss Contingencies [Line Items]
Amount of potential cash payments that could result from unrecognized tax benefits	$ 122
Unrecorded Unconditional Purchase Obligation Payable in Common Stock Per Year | Maximum
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	10
Unrecorded Unconditional Purchase Obligation Payable in Common Stock | Maximum
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 32

Commitments And Contingencies60

Commitments And Contingencies (Minimum Contractual Obligations) (Details) $ in Millions	Sep. 30, 2017USD ($)
Long Term Purchase Commitments
TotalUnconditionalPurchaseObligationBalanceSheetAmount	$ 3,165
TotalUnconditionalPurchaseObligationBalanceSheetAmountRemainingForCurrentFiscalYear	168
Total Unconditional PurchaseObligationBalanceSheetAmountOneYearAfterFiscalYearEnd	545
Total Unconditional Purchase Obligation Balance Sheet Amount Two Years After Fiscal Year End	471
TotalUnconditionalPurchaseObligationBalanceSheetAmountThreeYearsAfterFiscalYearEnd	997
TotalUnconditionalPurchaseObligationBalanceSheetAmountFourYearsAfterFiscalYearEnd	350
Total Unconditional Purchase Obligation Balance Sheet Amount Five Years After Fiscal Year End	115
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	519
Developer/Licensor Commitments - Royalty and Non-Royalty Bearing
Long Term Purchase Commitments
Unrecorded Total	1,061
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	78
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	296
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	243
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	206
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	194
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	43
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	1
Marketing
Long Term Purchase Commitments
Unrecorded Total	422
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	26
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	115
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	103
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	77
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	74
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	27
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Operating leases
Long Term Purchase Commitments
Unrecorded Total	231
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	18
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	37
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	37
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	30
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	22
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	46
Senior Notes Interest
Long Term Purchase Commitments
Unrecorded Total	237
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	17
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	20
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	58
Other unrecorded purchase obligations
Long Term Purchase Commitments
Unrecorded Total	97
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	14
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	28
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	22
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	10
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	5
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	4
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	14
Total Unrecorded Unconditional Purchase Obligation [Domain]
Long Term Purchase Commitments
Unrecorded Total	2,048
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	153
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	521
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	446
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	371
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	323
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	115
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	119
Total Recorded Unconditional Purchase Obligation [Domain]
Long Term Purchase Commitments
Recorded Total	1,117
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	15
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	24
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	25
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	626
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	27
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	0
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	400
Senior Notes and Interest
Long Term Purchase Commitments
Recorded Total	1,003
Senior Notes Interest
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	3
Senior Notes
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	600
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	400
Licensing and lease obligations
Long Term Purchase Commitments
Recorded Total	114
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	12
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	24
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	25
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	26
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	27
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	0
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	$ 0

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	May 08, 2017	May 04, 2015
Market-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options and restricted stock rights	$ 67		$ 67
Market-Based Restricted Stock Units [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on total stockholder return ("TSR")	0.00%		0.00%
Market-Based Restricted Stock Units [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on total stockholder return ("TSR")	200.00%		200.00%
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options and restricted stock rights	$ 41		$ 41
Performance Based Restricted Stock Units [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on total stockholder return ("TSR")	0.00%		0.00%
Performance Based Restricted Stock Units [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on total stockholder return ("TSR")	200.00%		200.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options and restricted stock rights	$ 1		$ 1
Restricted Stock Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options and restricted stock rights	429		$ 429
Weighted-average service period			2 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options and restricted stock rights	$ 320		$ 320
May 2015 Repurchase Program [Member] [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of common stock authorized for repurchase						$ 1,000
Stock Repurchased and Retired During Period, Shares	0	1.6	0.3	3.5
Repurchase and retirement of common stock	$ 0	$ 127	$ 31	$ 256
May 2017 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of common stock authorized for repurchase					$ 1,200
Stock Repurchased and Retired During Period, Shares	1.3		2.4
Repurchase and retirement of common stock	$ 153		$ 272
Repurchase Program, Total [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchased and Retired During Period, Shares	1.3	1.6	2.7	3.5
Repurchase and retirement of common stock	$ 153	$ 127	$ 303	$ 256
Stock-based compensation expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Income Tax Expense (Benefit)	$ 12	$ 9	22	$ 18
Accounting Standards Update 2016-09 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax			$ 8

Stock-Based Compensation (Sched

Stock-Based Compensation (Schedule Of Assumptions Used In Black-Scholes Model) (Details)	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends	0.00%	0.00%
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Volatility Rate	28.00%	31.00%
Minimum | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	1.13%	0.50%
Expected volatility, minimum	28.00%	29.00%
Expected Term	6 months	6 months
Maximum | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, maximum	1.24%	0.60%
Expected volatility, maximum	28.00%	32.00%
Expected Term	12 months	12 months

Stock-Based Compensation (Sch63

Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 62	$ 48	$ 110	$ 96
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1	1	2	2
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	36	27	64	54
Marketing and Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	9	8	16	15
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 16	$ 12	$ 28	$ 25

Stock-Based Compensation (Sch64

Stock-Based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Sep. 30, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options, Outstanding, Beginning Balance | shares	2,377
Options, Granted | shares	2
Options, Exercised | shares	(744)
Options, Forfeited, cancelled or expired | shares	(2)
Options, Outstanding, Ending Balance | shares	1,633
Options, Vested and expected to vest | shares	1,633
Options, Exercisable | shares	1,553
Weighted-average exercise price of options outstanding, beginning balance | $ / shares	$ 33.35
Weighted-average exercise price of options granted during period | $ / shares	105.99
Weighted-average exercise price of options exercised during the period | $ / shares	40.47
Weighted-average exercise price of options forfeited, cancelled or expired during the period | $ / shares	46.31
Weighted-average exercise price of options outstanding, ending balance | $ / shares	30.19
Weighted-average exercise price of options vested and expected to vest | $ / shares	30.19
Weighted-average exercise price of options exercisable | $ / shares	$ 30.40
Weighted-average remaining contractual term of options outstanding	5 years 10 months 29 days
Weighted-average remaining contractual term of options vested and expected to vest	5 years 10 months 29 days
Weighted-average remaining contractual term of options exercisable	5 years 10 months 25 days
Aggregate intrinsic value of options outstanding | $	$ 143
Aggregate intrinsic value of options vested and expected to vest | $	143
Aggregate intrinsic value of options exercisable | $	$ 136

Stock-Based Compensation (Sch65

Stock-Based Compensation (Schedule Of Restricted Stock Rights Activity, Excluding Performance-Based Activity) (Details) - Restricted Stock Rights [Member] shares in Thousands	6 Months Ended
	Sep. 30, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding balance | shares	5,153
Granted | shares	1,881
Vested | shares	(2,158)
Forfeited or cancelled | shares	(244)
Outstanding balance | shares	4,632
Weighted-average grant date fair value, beginning balance | $ / shares	$ 65.03
Weighted-average grant date fair value, vested during period | $ / shares	110.72
Weighted-average grant date fair value, vested during period | $ / shares	110.98
Weighted-average grant date fair value, forfeited or cancelled during period | $ / shares	74.73
Weighted-average grant date fair value, ending balance | $ / shares	$ 61.67

Stock-Based Compensation (Sch66

Stock-Based Compensation (Schedule Of Performance-Based Restricted Stock Unit Activity) (Details) - Restricted Stock Rights [Member] shares in Thousands	6 Months Ended
	Sep. 30, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted | shares	796
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding balance | shares	0
Forfeited or cancelled | shares	0
Outstanding balance | shares	796
Weighted-average grant date fair value, beginning balance | $ / shares	$ 0
Weighted-average grant date fair value, vested during period | $ / shares	110.51
Weighted-average grant date fair value, forfeited or cancelled during period | $ / shares	0
Weighted-average grant date fair value, ending balance | $ / shares	$ 110.51

Stock-Based Compensation (Sch67

Stock-Based Compensation (Schedule Of Market-Based Restricted Stock Unit Activity) (Details) - Market-Based Restricted Stock Units [Member] shares in Thousands	6 Months Ended
	Sep. 30, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding balance | shares	1,282
Granted | shares	706
Vested | shares	(430)
Forfeited or cancelled | shares	(216)
Outstanding balance | shares	1,342
Weighted-average grant date fair value, beginning balance | $ / shares	$ 87.37
Weighted-average grant date fair values of market-based restricted stock rights granted | $ / shares	140.93
Weighted-average grant date fair value, vested during period | $ / shares	76.27
Weighted-average grant date fair value, forfeited or cancelled during period | $ / shares	91.88
Weighted-average grant date fair value, ending balance | $ / shares	$ 118.35

Stock-Based Compensation Schedu

Stock-Based Compensation Schedule of Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	May 08, 2017	May 04, 2015
May 2015 Repurchase Program [Member] [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 0	$ 127	$ 31	$ 256
Stock Repurchase Program, Authorized Amount						$ 1,000
Stock Repurchased and Retired During Period, Shares	0	1.6	0.3	3.5
May 2017 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 153		$ 272
Stock Repurchase Program, Authorized Amount					$ 1,200
Stock Repurchased and Retired During Period, Shares	1.3		2.4
Repurchase Program, Total
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 153	$ 127	$ 303	$ 256
Stock Repurchased and Retired During Period, Shares	1.3	1.6	2.7	3.5

Earnings (Loss) Per Share (Narr

Earnings (Loss) Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share, Amount	3	3
Warrants
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share, Amount		10

Earnings (Loss) Per Share Earni

Earnings (Loss) Per Share Earnings (Loss) Per Share (Computation Of Basic Earnings And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Net income (loss)	$ (22)	$ (38)	$ 622	$ 402
Weighted Average Number of Shares Outstanding, Basic	309	301	309	301
Dilutive potential common shares related to stock award plans and from assumed exercise of stock options	0	0	4	3
Weighted Average Number of Shares Outstanding, Diluted	309	301	313	315
Basic	$ (0.07)	$ (0.13)	$ 2.01	$ 1.34
Diluted	$ (0.07)	$ (0.13)	$ 1.99	$ 1.28
Convertible Debt
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	0	0	0	2
Warrants
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	0	0	0	9