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Stockholders' Equity - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Jan. 31, 2021 | May 31, 2018
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Additional authorized |  |  |  | $ 2,000 | $ 4,000
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |
Beginning balance | $ 1,535 | $ 3,469 | $ 1,096 |  |
Ending balance | $ 2,785 | $ 1,535 | $ 3,469 |  |
Open Market Transactions |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Total Number of Shares Purchased (in shares) | 4.7 | 9.2 | 10.4 |  |
Average price paid per share (in dollars per share) | $ 160.33 | $ 144.68 | $ 132.14 |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |
Shares repurchased | $ (750) | $ (1,334) | $ (1,377) |  |
Accelerated Share Repurchase |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Total Number of Shares Purchased (in shares) |  | 4.7 | 2.1 |  |
Average price paid per share (in dollars per share) |  | $ 127.68 | $ 117.98 |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |
Shares repurchased |  | $ (600) | $ (250) |  |

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