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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, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Feb. 28, 2022
Accelerated Share Repurchases [Line Items] |  |  |  |
Shares repurchase authorization increase in 2021 | $ 4,000 | $ 2,000 |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Beginning balance | 2,785 | 1,535 | $ 3,469 |
Ending balance | $ 3,278 | 2,785 | $ 1,535 |
Other accrued liabilities |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Accrued shares repurchased |  | $ 8 |  |
Open Market Transactions |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Total Number of Shares Purchased (in shares) | 4.6 | 4.7 | 9.2 |
Average price paid per share (in dollars per share) | $ 217.73 | $ 160.33 | $ 144.68 |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Shares repurchased | $ (1,007) | $ (750) | $ (1,334) |
Accelerated Share Repurchase, May 2019 |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Total Number of Shares Purchased (in shares) |  |  | 4.7 |
Average price paid per share (in dollars per share) |  |  | $ 127.68 |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Shares repurchased |  |  | $ (600) |
Accelerated Share Repurchase, May 2021 |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Total Number of Shares Purchased (in shares) | 5.2 |  |  |
Average price paid per share (in dollars per share) | $ 193.22 |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Shares repurchased | $ (1,000) |  |  |
Accelerated Share Repurchase, February 2022 |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Total Number of Shares Purchased (in shares) | 4.8 |  |  |
Average price paid per share (in dollars per share) | $ 265.56 |  |  |
Shares repurchase authorization increase in 2021 |  |  |  | $ 1,500
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Shares repurchased | $ (1,500) |  |  |

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