Investments - (Tables)

12 Months Ended

Mar. 31, 2022

Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Abstract]

Schedule of Carrying Value of Investments

The carrying value of investments are as follows: 

(Dollars in millions)
	As of
	March 31, 2022		March 31, 2021
Current investments
Amortized cost:
Quoted debt securities
Cost		29		—
Fair value through profit and loss:
Liquid mutual funds
Fair value	266		205
Fair Value through Other comprehensive income:
Quoted debt securities
Fair value	133		115
Certificates of deposit
Fair value		452		—
		880		320
Non-Current investments
Amortized cost:
Quoted debt securities
Cost	251		294
Fair value through Other comprehensive income:
Quoted debt securities
Fair value		1,501		1,293
Unquoted equity and preference securities
Fair value	26		23
Fair value through profit and loss:
Unquoted Compulsorily convertible debentures
Fair value		1		1
Unquoted Preference securities
Fair value	3		2
Others:
Fair value	19		10
		1,801		1,623
Total Investments		2,681		1,943
Investment carried at amortized cost		280		294
Investments carried at fair value through other comprehensive income		2,112		1,431
Investments carried at fair value through profit and loss		289		218

Note: Uncalled capital commitments outstanding as of March 31, 2022, and March 31, 2021, was $4 million and $6 million, respectively.

Schedule of Amounts Recorded in Other Comprehensive Income

Details of amounts recorded in other comprehensive income:

(Dollars in millions)
Net gain / (loss) on	Year ended March 31, 2022
	Gross			Tax			Net
Quoted debt securities		(9	)		3			(6	)
Unquoted equity and preference securities		15			(3	)		12

(Dollars in millions)
Net gain / (loss) on	Year ended March 31, 2021
	Gross			Tax			Net
Quoted debt securities		(17	)		3			(14	)
Unquoted equity and preference securities		19			(3	)		16

(Dollars in millions)
Net gain / (loss) on	Year ended March 31, 2020
	Gross			Tax			Net
Quoted debt securities		4			—			4
Certificate of deposits		(1	)		—			(1	)
Unquoted equity and preference securities		(4	)		(1	)		(5	)

Schedule of Method of Fair Valuation

Method of fair valuation:

(Dollars in millions)
		Fair value
		As at March 31
Class of investment	Method	2022		2021
Liquid mutual funds- carried at fair value through profit or loss	Quoted price		266		205
Quoted debt securities- carried at amortized cost	Quoted price and market observable inputs		323		347
Quoted debt securities- carried at Fair value through other comprehensive income	Quoted price and market observable inputs		1,634		1,408
Certificate of deposits	Market observable inputs		452		—
Unquoted equity and preference securities at fair value through other comprehensive income	Discounted cash flows method, Market multiples method, Option pricing model		26		23
Unquoted equity and preference securities- carried at fair value through profit or loss	Discounted cash flows method, Market multiples method, Option pricing model		3		2
Unquoted compulsorily convertible debentures- carried at fair value through profit or loss	Discounted cash flows method		1		1
Others	Discounted cash flows method, Market multiples method, Option pricing model		19		10
			2,724		1,996

Note: Certain quoted investments are classified as Level 2 in the absence of active market for such investments.