Earnings per share - Schedule of Computation for Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income (Numerator):
Net income for basic and diluted EPS	$ 4,090	$ 6,717	$ 6,552
Shares (Denominator):
Weighted-average shares for basic EPS (in shares)	537	535	538
Effect of dilutive securities (in shares)	4	3	3
Weighted-average shares for diluted EPS (in shares)	541	538	541
Basic EPS (in usd per share)	$ 7.62	$ 12.56	$ 12.18
Diluted EPS (in usd per share)	$ 7.56	$ 12.49	$ 12.11