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Income Taxes (Tables)
12 Months Ended
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,
 202020192018
Domestic$380  $170  $440  
Foreign1,128  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):
 CurrentDeferredTotal
Year Ended March 31, 2020
Federal$258  $(14) $244  
State39  (2) 37  
Foreign48  (1,860) (1,812) 
$345  $(1,876) $(1,531) 
Year Ended March 31, 2019
Federal$29  $(18) $11  
State —   
Foreign42   44  
$76  $(16) $60  
Year Ended March 31, 2018
Federal$138  $197  $335  
State  13  
Foreign61  (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,
 202020192018
Statutory federal tax expense rate21.0 %21.0 %31.5 %
State taxes, net of federal benefit1.0 %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 opinion5.4 %— %— %
Non-deductible stock-based compensation2.3 %2.3 %2.7 %
Other0.6 %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,
 20202019
Deferred tax assets:
Accruals, reserves and other expenses$141  $101  
Tax credit carryforwards137  140  
Stock-based compensation37  33  
Net operating loss and capital loss carryforwards195  22  
Swiss intra-entity tax asset1,818  —  
Total2,328  296  
Valuation allowance(288) (162) 
Deferred tax assets, net of valuation allowance2,040  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 positions10  
Decreases in unrecognized tax benefits related to prior year tax positions(12) 
Increases in unrecognized tax benefits related to current year tax positions75  
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 
Balance as of March 31, 2018457  
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 positions43  
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, 2019417  
Increases in unrecognized tax benefits related to prior year tax positions111  
Decreases in unrecognized tax benefits related to prior year tax positions(4) 
Increases in unrecognized tax benefits related to current year tax positions468  
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