Accounts Receivable (Tables) - Trade receivables [member]

12 Months Ended

Dec. 31, 2020

Statement [LineItems]

Aging Analysis of Accounts Receivable, Net of Loss Allowance

Aging analysis of accounts receivable, net of loss allowance is as follows:

	As of		As of
	December 31, 2020 Million		December 31, 2019 Million
Within 30 days		14,917		14,353
31 - 60 days		4,132		3,789
61 - 90 days		3,255		3,035
91 days - 1 year		13,076		9,575
Over 1 year		3,021		1,942
		38,401		32,694

Summary of Changes in Loss Allowance of Accounts Receivable

The following table summarizes the changes in expected credit impairment loss allowance of accounts receivable:

	2020			2019
	Million			Million
As of January 1		9,557			7,269
Additions		5,105			5,833
Written-off		(3,072	)		(3,545	)
As of December 31		11,590			9,557