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Events after the balance sheet date - Summary of exercising option to redeem outstanding principal amount (Detail) - Event After Reporting Date [Member] $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
3.650% Notes due 2026
Disclosure Of Exercising Option To Redeem Outstanding Principal Amount [Line Items]
Date of redemption	Feb. 09, 2022
Issuer	ABIFI
Title of series of notes issued redeemed	3.650% Notes due 2026
Currency	USD
Original principal amount outstanding	$ 1,633
Principal amount redeemed	$ 1,633
4.915% Notes due 2046
Disclosure Of Exercising Option To Redeem Outstanding Principal Amount [Line Items]
Date of redemption	Mar. 01, 2022
Issuer	ABIFI
Title of series of notes issued redeemed	4.915% Notes due 2046
Currency	USD
Original principal amount outstanding	$ 1,470
Principal amount redeemed	$ 1,470

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The amount of outstanding funds that the entity is obligated to repay.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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