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Stockholders' Deficit - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) vote $ / shares shares | Jun. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) vote $ / shares | Sep. 30, 2023 USD ($) $ / shares | Mar. 31, 2024 USD ($) | Jul. 31, 2024 USD ($)
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Number of votes per share of common stock permitted on proposals presented to stockholders (vote) | vote | 1 |  |  |  | 1 |  |  |
Dividends declared per common share (in dollars per share) | $ / shares | $ 0.71 | $ 0.62 | $ 0.62 |  | $ 1.33 | $ 1.16 |  |
Other accrued liabilities | $ 4,787 |  |  |  | $ 4,787 |  | $ 4,915 |
Excise taxes |  |  |  |  | 41 |  | $ 25 |
Authorized repurchase amount (up to) |  |  |  |  |  |  |  | $ 4,000
Authorized amount available for future repurchases | $ 8,600 |  |  |  | 8,600 |  |  |
Open Market Share Repurchase Transactions |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Common stock repurchased (in shares) | shares | 2.9 | 1.0 | 2.0 | 1.8 |  |  |  |
Shares repurchased | $ 1,500 | $ 528 | $ 840 | $ 673 |  |  |  |
Average price of shares repurchased (in usd per share) | $ / shares | $ 533.46 | $ 548.20 | $ 422.39 | $ 379.14 |  |  |  |
Other accrued liabilities | $ 22 |  | $ 23 |  | 22 | $ 23 |  |
Excise taxes | $ 15 |  | $ 8 |  | $ 16 | $ 12 |  |

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