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Earnings per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income (Numerator):
Net income for basic and diluted EPS	$ 1,992	$ 2,311
Shares (Denominator):
Weighted-average shares for basic EPS (in shares)	622	707
Effect of dilutive securities (in shares)	4	4
Weighted-average shares for diluted EPS (in shares)	626	711
Basic EPS (in usd per share)	$ 3.20	$ 3.27
Diluted EPS (in usd per share)	$ 3.18	$ 3.25

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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