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Stockholders' equity (Details Textual) (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 08, 2022 $ / shares | Aug. 03, 2022 $ / shares | Feb. 25, 2022 USD ($) shares | Jun. 30, 2022 USD ($) $ / shares | Mar. 31, 2022 $ / shares | Dec. 31, 2021 $ / shares | Jun. 30, 2022 USD ($) shares | Mar. 31, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) shares | Mar. 31, 2021 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) shares | Jun. 30, 2021 USD ($) shares | Feb. 24, 2022 financial_institution
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, Shares | shares |  |  |  |  |  |  | 0.0 | 24.6 | 6.5 | 3.7 | 24.6 | 10.2 |
Stock repurchased |  |  |  |  |  |  | $ 0 | $ 5,410 | $ 1,592 | $ 865 | $ 5,410 | $ 2,457 |
Repurchases of common stock |  |  |  |  |  |  |  | $ 6,310 | 1,592 | $ 865 |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan |  |  |  | $ 4,600 |  |  | $ 4,600 |  |  |  | $ 4,600 |  |
Dividends declared per share (in usd per share) | $ / shares |  |  |  |  | $ 1.94 | $ 1.94 |  | $ 1.94 |  | $ 1.76 |  |  |
Dividends paid per share (in usd per share) | $ / shares |  |  |  | $ 1.94 | $ 1.94 |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in usd per share) | $ / shares |  | $ 1.94 |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  |  |  |  |  |  |  | $ 5,410 | $ 1,592 | $ 865 |  |  |
Common stock and additional paid-in capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  |  |  |  |  |  |  | $ 900 |  |  |  |  |
Accelerated stock repurchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, Shares | shares |  |  | 23.3 |  |  |  |  |  |  |  |  |  |
Stock repurchased |  |  | $ 6,000 |  |  |  |  |  |  |  |  |  |
Number of Third-Party Financial Institutions | financial_institution |  |  |  |  |  |  |  |  |  |  |  |  | 3
Accelerated stock repurchase agreement | Accumulated deficit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  |  | 5,100 |  |  |  |  |  |  |  |  |  |
Accelerated stock repurchase agreement | Common stock and additional paid-in capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  |  | $ 900 |  |  |  |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per share (in usd per share) | $ / shares | $ 1.94 |  |  |  |  |  |  |  |  |  |  |  |

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