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Employee Benefit Plans and Similar Obligations - Summary of Share Based Compensation Plan (Plan 2016-2019) (Detail) - Plan 2016-19 [member] $ in Millions	12 Months Ended
	Dec. 31, 2018 ARS ($)	Dec. 31, 2018 $ / shares	Dec. 31, 2017 ARS ($)	Dec. 31, 2017 $ / shares	Dec. 31, 2016 ARS ($)	Dec. 31, 2016 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Amount at the beginning of the year	393,972		682,307
Granted					682,307
Settled	(189,303)		(228,981)
Expired	(21,589)		(59,354)
Amount at end of year	183,080		393,972		682,307
Expense recognized during the year | $	$ 54		$ 59		$ 56
Fair value of shares on grant date (in U.S. dollars) | $ / shares		$ 16.99		$ 16.99		$ 16.99

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The number of share options outstanding in a share-based payment arrangement.

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The number of share options exercised in a share-based payment arrangement.

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