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v3.23.1

Stockholders' equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchased (in shares) |  |  |  |  | 0.0 |  | 24.6
Stock repurchased |  |  |  |  | $ 0 |  | $ 5,410
Repurchases of common stock |  |  |  |  |  | $ 6,310 |
Amount available for stock repurchases under a board approved stock repurchase plan |  | $ 7,000 |  | $ 7,000 |  |  |
Dividends declared per share (in usd per share) |  | $ 2.13 | $ 2.13 | $ 2.13 |  | $ 1.94 |
Dividends paid per share (in usd per share) |  | $ 2.13 |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Repurchases of common stock |  |  |  |  |  | $ 5,410 |
Common stock and additional paid-in capital |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Repurchases of common stock |  |  |  |  |  | $ 900 |
Forecast |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends paid per share (in usd per share) | $ 2.13 |  |  |  |  |  |

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