Investments - Schedule of Method of Fair Valuation (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 2,952	$ 2,371
Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	2,977	2,399
Fair Value Through Profit or Loss
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	388	189
Amortized Cost
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	211	233
Fair Value Through Other Comprehensive Income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 2,353	1,949
Liquid Mutual Funds \| Fair Value Through Profit or Loss
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Quoted price
Liquid Mutual Funds \| Fair Value Through Profit or Loss \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 313	119
Target Maturity Fund Units \| Fair Value Through Profit or Loss
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Quoted price
Target Maturity Fund Units \| Fair Value Through Profit or Loss \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 51	49
Quoted Debt Securities \| Amortized Cost
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Quoted price and marketobservable inputs
Quoted Debt Securities \| Amortized Cost \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 236	261
Quoted Debt Securities \| Fair Value Through Other Comprehensive Income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Quoted price and marketobservable inputs
Quoted Debt Securities \| Fair Value Through Other Comprehensive Income \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 1,384	1,400
Commercial Paper \| Fair Value Through Other Comprehensive Income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Market observable inputs
Commercial Paper \| Fair Value Through Other Comprehensive Income \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 579	90
Certificates of Deposit \| Fair Value Through Other Comprehensive Income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Market observable inputs
Certificates of Deposit \| Fair Value Through Other Comprehensive Income \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 365	435
Unquoted Equity and Preference Securities \| Fair Value Through Other Comprehensive Income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Discounted cash flows method,Market multiples method,Option pricing model
Unquoted Equity and Preference Securities \| Fair Value Through Other Comprehensive Income \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 11	24
Quoted Equity Secutities \| Fair Value Through Other Comprehensive Income \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 14
Others \| Fair Value Through Profit or Loss
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Method	Discounted cash flows method,Market multiples method,Option pricing model
Others \| Fair Value Through Profit or Loss \| Fair Value
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Fair value	$ 24	$ 21

The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques [member]; Cost approach [member]; Income approach [member]; Market approach [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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