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Balance Sheet Details (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020 | [1]
Remaining Performance Obligations |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months |  | 12 months |  |
Depreciation expense | $ 37 | $ 29 | $ 100 | $ 89 |
Deferred Revenue, Current | 1,380 |  | 1,380 |  | $ 945
Deferred Revenue, Revenue Recognized |  |  | 1,002 | $ 1,169 |
Unsatisfied Performance Obligations [Member] |  |  |  |  |
Remaining Performance Obligations |  |  |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 33 |  | $ 33 |  |
[1] | Derived from audited Consolidated Financial Statements.

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