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Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 20 | $ (17) | $ 14 | $ (52)
Unrealized Gains (Losses) on Derivative Instruments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 20 | (17) | 14 | (51)
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) | 22 | (18) | 10 | (59)
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) | $ 1 | $ 4 | $ 8

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