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Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2020
Income Tax Disclosure [Abstract] |
Components Of Income Before Provision For (Benefit From) Income Taxes | The components of our income before provision for (benefit from) income taxes for the fiscal years ended March 31, 2020, 2019 and 2018 are as follows (in millions):
| Year Ended March 31, |  |  |  |
| 2020 |  | 2019 |  | 2018
Domestic | $ | 380 |  |  | $ | 170 |  |  | $ | 440 |
Foreign | 1,128 |  |  | 909 |  |  | 1,009 |
Income before provision for (benefit from) income taxes | $ | 1,508 |  |  | $ | 1,079 |  |  | $ | 1,449 |
Provision For (Benefit From) Income Taxes | Provision for (benefit from) income taxes for the fiscal years ended March 31, 2020, 2019 and 2018 consisted of (in millions):
| Current |  | Deferred |  | Total
Year Ended March 31, 2020 |  |  |  |  |
Federal | $ | 258 |  |  | $ | (14) |  |  | $ | 244 |
State | 39 |  |  | (2) |  |  | 37 |
Foreign | 48 |  |  | (1,860) |  |  | (1,812) |
| $ | 345 |  |  | $ | (1,876) |  |  | $ | (1,531) |
Year Ended March 31, 2019 |  |  |  |  |
Federal | $ | 29 |  |  | $ | (18) |  |  | $ | 11 |
State | 5 |  |  | — |  |  | 5 |
Foreign | 42 |  |  | 2 |  |  | 44 |
| $ | 76 |  |  | $ | (16) |  |  | $ | 60 |
Year Ended March 31, 2018 |  |  |  |  |
Federal | $ | 138 |  |  | $ | 197 |  |  | $ | 335 |
State | 4 |  |  | 9 |  |  | 13 |
Foreign | 61 |  |  | (3) |  |  | 58 |
| $ | 203 |  |  | $ | 203 |  |  | $ | 406 |
Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate | The differences between the statutory tax rate and our effective tax rate, expressed as a percentage of income before provision for (benefit from) income taxes, for the fiscal years ended March 31, 2020, 2019 and 2018 were as follows:
| Year Ended March 31, |  |  |  |
| 2020 |  | 2019 |  | 2018
Statutory federal tax expense rate | 21.0 | % |  | 21.0 | % |  | 31.5 | %
State taxes, net of federal benefit | 1.0 | % |  | 0.7 | % |  | 0.8 | %
Differences between statutory rate and foreign effective tax rate | (8.4) | % |  | (14.4) | % |  | (19.1) | %
Tax reform | — | % |  | (0.4) | % |  | 16.2 | %
Excess tax benefit | (0.1) | % |  | (1.9) | % |  | (3.0) | %
Research and development credits | (1.2) | % |  | (2.4) | % |  | (1.4) | %
Swiss Deferred Tax Asset | (122.1) | % |  | — | % |  | — | %
The Altera opinion | 5.4 | % |  | — | % |  | — | %
Non-deductible stock-based compensation | 2.3 | % |  | 2.3 | % |  | 2.7 | %
Other | 0.6 | % |  | 0.7 | % |  | 0.3 | %
Effective tax rate | (101.5) | % |  | 5.6 | % |  | 28.0 | %
Deferred Tax Assets And Liabilities | The components of net deferred tax assets, as of March 31, 2020 and 2019 consisted of (in millions):
| As of March 31, |  |
| 2020 |  | 2019
Deferred tax assets: |  |  |
Accruals, reserves and other expenses | $ | 141 |  |  | $ | 101 |
Tax credit carryforwards | 137 |  |  | 140 |
Stock-based compensation | 37 |  |  | 33 |
Net operating loss and capital loss carryforwards | 195 |  |  | 22 |
Swiss intra-entity tax asset | 1,818 |  |  | — |
Total | 2,328 |  |  | 296 |
Valuation allowance | (288) |  |  | (162) |
Deferred tax assets, net of valuation allowance | 2,040 |  |  | 134 |
Deferred tax liabilities: |  |  |
Amortization and depreciation | (85) |  |  | (28) |
ASC 606 Revenue Recognition | (43) |  |  | (66) |
Other | (10) |  |  | (7) |
Total | (138) |  |  | (101) |
Deferred tax assets, net of valuation allowance and deferred tax liabilities | $ | 1,902 |  |  | $ | 33 |
Schedule Of Unrecognized Tax Benefits | A reconciliation of the beginning and ending balance of unrecognized tax benefits is summarized as follows (in millions):
Balance as of March 31, 2017 | $ | 389 |
Increases in unrecognized tax benefits related to prior year tax positions | 10 |
Decreases in unrecognized tax benefits related to prior year tax positions | (12) |
Increases in unrecognized tax benefits related to current year tax positions | 75 |
Decreases in unrecognized tax benefits related to settlements with taxing authorities | (7) |
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations | (2) |
Changes in unrecognized tax benefits due to foreign currency translation | 4 |
Balance as of March 31, 2018 | 457 |
Increases in unrecognized tax benefits related to prior year tax positions | — |
Decreases in unrecognized tax benefits related to prior year tax positions | (41) |
Increases in unrecognized tax benefits related to current year tax positions | 43 |
Decreases in unrecognized tax benefits related to settlements with taxing authorities | (16) |
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations | (21) |
Changes in unrecognized tax benefits due to foreign currency translation | (5) |
Balance as of March 31, 2019 | 417 |
Increases in unrecognized tax benefits related to prior year tax positions | 111 |
Decreases in unrecognized tax benefits related to prior year tax positions | (4) |
Increases in unrecognized tax benefits related to current year tax positions | 468 |
Decreases in unrecognized tax benefits related to settlements with taxing authorities | — |
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations | (5) |
Changes in unrecognized tax benefits due to foreign currency translation | (4) |
Balance as of March 31, 2020 | $ | 983 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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