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Net income per common share - Additional Information (Details) - Accelerate share repurchase - USD ($) $ / shares in Units, $ in Millions			1 Months Ended		9 Months Ended
	Sep. 09, 2021	May 03, 2021	May 27, 2020	Jan. 30, 2020	Sep. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Accelerated share repurchases settlement receipt					$ 350	$ 500
Initial shares received as part of an accelerated share repurchase program		3,785,831		7,055,919
Common Shares Repurchased Accelerated Share Repurchase Agreements	828,965
Common shares attributable to ASR	4,614,796
Accelerated share repurchases price paid per share	$ 75.8430		$ 42.3043		$ 75.84

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Initial shares received as part of an accelerated share repurchase program.

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Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

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-Publisher FASB
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-Topic 505
-SubTopic 30
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Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of accelerated share repurchase agreements. An accelerated share repurchase program is a combination of transactions that permits an entity to purchase a targeted number of shares immediately with the final purchase price of those shares determined by an average market price over a fixed period of time.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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