|**Financing Arrangement (Tables)**                                                                | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|**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 December 31, 2017As of March 31, 2017Senior Notes:3.70% Senior Notes due 2021$600$6004.80% Senior Notes due 2026400400Total principal amount$1,000$1,000Unaccreted discount(2)(2)Unamortized debt issuance costs(6)(8)Net carrying value of Senior Notes$992$990Fair value of Senior Notes (Level 2)$1,059$1,054                                                                                                                                          
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|                                                                                                  | As of December 31, 2017                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Senior Notes:                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|3.70% Senior Notes due 2021                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|4.80% Senior Notes due 2026                                                                       | 400                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Total principal amount                                                                            | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Unaccreted discount                                                                               | (2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Unamortized debt issuance costs                                                                   | (6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Net carrying value of Senior Notes                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Fair value of Senior Notes (Level 2)                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Schedule Of Interest Expense                                                                      | The following table summarizes our interest expense recognized for thethree and nine months ended December 31, 2017 and 2016that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions):Three Months Ended December 31,Nine Months Ended December 31,2017201620172016Amortization of debt discount$—$—$—$(2)Amortization of debt issuance costs—(1)(1)(2)Coupon interest expense(10)(10)(31)(31)Other interest expense—(1)—(1)Total interest expense$(10)$(12)$(32)$(36)
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|                                                                                                  | Three Months Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                  | 2017                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Amortization of debt discount                                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Amortization of debt issuance costs                                                               | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Coupon interest expense                                                                           | (10                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Other interest expense                                                                            | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Total interest expense                                                                            | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

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