Earnings per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income (Numerator):
Net income for basic and diluted EPS	$ 2,841	$ 1,476
Shares (Denominator):
Weighted-average shares for basic EPS (in shares)	534	548
Effect of dilutive securities (in shares)	4	3
Weighted-average shares for diluted EPS (in shares)	538	551
Basic EPS (in usd per share)	$ 5.32	$ 2.69
Diluted EPS (in usd per share)	$ 5.28	$ 2.68