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Earnings per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Numerator):
Net income for basic and diluted EPS	$ 1,703	$ 1,968	$ 2,179	$ 1,992	$ 1,928	$ 1,859	$ 2,296	$ 2,311	$ 7,842	$ 8,394	$ 1,979
Shares (Denominator):
Weighted-average shares for basic EPS									605	661	731
Effect of dilutive securities (in shares)									4	4	4
Weighted-average shares for diluted EPS									609	665	735
Basic EPS (in usd per share)	$ 2.87	$ 3.29	$ 3.59	$ 3.20	$ 3.04	$ 2.88	$ 3.50	$ 3.27	$ 12.96	$ 12.70	$ 2.71
Diluted EPS (in usd per share)	$ 2.85	$ 3.27	$ 3.57	$ 3.18	$ 3.01	$ 2.86	$ 3.48	$ 3.25	$ 12.88	$ 12.62	$ 2.69

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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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