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Accumulated Other Comprehensive Income Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ (64) | $ (7) | $ (1)
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (2) | 1 | 4
Unrealized Gains (Losses) on Available-for-Sale Securities | Interest Income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (2) | 1 | 4
Unrealized Gains (Losses) on Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (62) | (8) | 5
Unrealized Gains (Losses) on Derivative Instruments | Sales Revenue, Net [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (71) | (18) | 10
Unrealized Gains (Losses) on Derivative Instruments | Research and Development |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 9 | 10 | (5)
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | (10)
Foreign Currency Translation Adjustment [Member] | Interest Income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 0 | $ 0 | $ (10)

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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
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