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Stockholders' equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended							3 Months Ended						9 Months Ended
	Dec. 31, 2023	Oct. 31, 2023	Sep. 30, 2023	Aug. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Class of Stock [Line Items]
Stock repurchased (in shares)								0.0	0.0	0.0	1.5	0.0	24.6	0.0	26.1
Stock repurchased								$ 0	$ 0	$ 0	$ 900	$ 0	$ 5,410	$ 0	$ 6,310
Repurchases of common stock											$ 0		$ 6,310
Amount available for stock repurchases under a board approved stock repurchase plan			$ 7,000					$ 7,000						$ 7,000
Dividends declared per share (in usd per share)				$ 2.13		$ 2.13	$ 2.13	$ 2.13		$ 2.13	$ 1.94		$ 1.94
Dividends paid per share (in usd per share)			$ 2.13		$ 2.13	$ 2.13
Subsequent Event
Class of Stock [Line Items]
Dividends declared per share (in usd per share)		$ 2.13
Accumulated deficit
Class of Stock [Line Items]
Repurchases of common stock											$ 900		$ 5,410
Common stock and additional paid-in capital
Class of Stock [Line Items]
Repurchases of common stock											$ (900)		$ 900
Forecast
Class of Stock [Line Items]
Dividends paid per share (in usd per share)	$ 2.13