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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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Income (Numerator):
Net income for basic and diluted EPS	$ 2,179	$ 1,992	$ 2,296	$ 2,311	$ 4,171	$ 4,607
Shares (Denominator):
Weighted-average shares for basic EPS (in shares)	607		656		615	682
Effect of dilutive securities (in shares)	3		4		3	3
Weighted-average shares for diluted EPS (in shares)	610		660		618	685
Basic EPS (in usd per share)	$ 3.59		$ 3.50		$ 6.78	$ 6.76
Diluted EPS (in usd per share)	$ 3.57		$ 3.48		$ 6.75	$ 6.73

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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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