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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, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Income (Numerator):
Net income for basic and diluted EPS	$ 464	$ 1,646	$ 1,803	$ 1,825	$ 2,110	$ 3,628
Shares (Denominator):
Weighted-average shares for basic EPS (in shares)	573		588		575	589
Effect of dilutive securities (in shares)	3		4		3	4
Weighted-average shares for diluted EPS (in shares)	576		592		578	593
Basic EPS (in usd per share)	$ 0.81		$ 3.07		$ 3.67	$ 6.16
Diluted EPS (in usd per share)	$ 0.81		$ 3.05		$ 3.65	$ 6.12

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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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-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1505-109256

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- References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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