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Earnings per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income (Numerator):
Net income for basic and diluted EPS	$ 2,296	$ 2,151	$ 4,607	$ 4,222
Shares (Denominator):
Weighted-average shares for basic EPS (in shares)	656	734	682	736
Effect of dilutive securities (in shares)	4	4	3	4
Weighted-average shares for diluted EPS (in shares)	660	738	685	740
Basic EPS (in usd per share)	$ 3.50	$ 2.93	$ 6.76	$ 5.74
Diluted EPS (in usd per share)	$ 3.48	$ 2.91	$ 6.73	$ 5.71

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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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