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Debt - Schedule of Long-term Debt (Details) € in Millions, ₨ in Millions, $ in Millions	Sep. 30, 2023 USD ($)	Sep. 30, 2023 EUR (€)	Jul. 31, 2023 USD ($)	Jul. 31, 2023 INR (₨)	Apr. 30, 2023 INR (₨)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 31, 2022 INR (₨)	Feb. 28, 2022 EUR (€)	Dec. 31, 2021	Dec. 31, 2015 EUR (€)
Debt Instrument [Line Items]
Long-term debt and short-term debt, gross	$ 15,787						$ 14,239
Less: Unamortized discount and debt issuance costs	(112)						(111)
Less: Cumulative hedge accounting fair value adjustment	(109)						(105)
Total debt outstanding	15,566						14,023
Less: short-term debt	(1,337)						(274)
Long-term debt	$ 14,229						13,749
2022 INR Term Loan
Debt Instrument [Line Items]
Stated interest rate	8.64%	8.64%
Effective interest rate	9.09%	9.09%
Short-term debt	$ 0		$ 285				275	₨ 22,700
2023 INR Term Loan
Debt Instrument [Line Items]
Stated interest rate	9.43%	9.43%
Effective interest rate	9.78%	9.78%
Short-term debt	$ 338		$ 342	₨ 28,100			0
April 2023 INR Term Loan
Debt Instrument [Line Items]
Stated interest rate					9.48%
Effective interest rate					9.705%
Short-term debt | ₨					₨ 4,970
Senior Notes | March 2028 Notes
Debt Instrument [Line Items]
Stated interest rate	4.875%	4.875%
Long-term debt, gross	$ 750					$ 750	0
Effective interest rate	5.003%	5.003%
Senior Notes | March 2033 Notes
Debt Instrument [Line Items]
Stated interest rate	4.85%	4.85%
Long-term debt, gross	$ 750					$ 750	0
Effective interest rate	4.923%	4.923%
Senior Notes | February 2029 Notes
Debt Instrument [Line Items]
Stated interest rate	1.00%	1.00%
Long-term debt, gross	$ 794						800		€ 750
Effective interest rate	1.138%	1.138%
Senior Notes | November 2031 Notes
Debt Instrument [Line Items]
Stated interest rate	2.00%	2.00%
Long-term debt, gross	$ 750						750
Effective interest rate	2.112%	2.112%
Senior Notes | March 2031 Notes
Debt Instrument [Line Items]
Stated interest rate	1.90%	1.90%
Long-term debt, gross	$ 600						600
Effective interest rate	1.981%	1.981%
Senior Notes | March 2051 Notes
Debt Instrument [Line Items]
Stated interest rate	2.95%	2.95%
Long-term debt, gross	$ 700						700
Effective interest rate	3.013%	3.013%
Senior Notes | 2027 Notes
Debt Instrument [Line Items]
Stated interest rate	3.30%	3.30%
Long-term debt, gross	$ 1,000						1,000
Effective interest rate	3.42%	3.42%
Senior Notes | 2030 Notes
Debt Instrument [Line Items]
Stated interest rate	3.35%	3.35%
Long-term debt, gross	$ 1,500						1,500
Effective interest rate	3.43%	3.43%
Senior Notes | Senior Notes Due March 2050
Debt Instrument [Line Items]
Stated interest rate	3.85%	3.85%								3.85%
Long-term debt, gross	$ 1,500						1,500
Effective interest rate	3.896%	3.896%
Senior Notes | 2029 Notes
Debt Instrument [Line Items]
Stated interest rate	2.95%	2.95%
Long-term debt, gross	$ 1,000						1,000
Effective interest rate	3.03%	3.03%
Senior Notes | 2049 Notes
Debt Instrument [Line Items]
Stated interest rate	3.65%	3.65%
Long-term debt, gross	$ 1,000						1,000
Effective interest rate	3.689%	3.689%
Senior Notes | 2025 Notes
Debt Instrument [Line Items]
Stated interest rate	2.00%	2.00%
Long-term debt, gross	$ 750						750
Effective interest rate	2.147%	2.147%
Senior Notes | 2028 Notes
Debt Instrument [Line Items]
Stated interest rate	3.50%	3.50%
Long-term debt, gross	$ 500						500
Effective interest rate	3.598%	3.598%
Senior Notes | 2048 Notes
Debt Instrument [Line Items]
Stated interest rate	3.95%	3.95%
Long-term debt, gross	$ 500						500
Effective interest rate	3.99%	3.99%
Senior Notes | 2026 Notes
Debt Instrument [Line Items]
Stated interest rate	2.95%	2.95%
Long-term debt, gross	$ 750						750
Effective interest rate	3.044%	3.044%
Senior Notes | 2046 Notes
Debt Instrument [Line Items]
Stated interest rate	3.80%	3.80%
Long-term debt, gross	$ 600						600
Effective interest rate	3.893%	3.893%
Senior Notes | 2.1% Notes due 2027
Debt Instrument [Line Items]
Stated interest rate	2.10%	2.10%
Long-term debt, gross	$ 846						854
Effective interest rate	2.189%	2.189%
Senior Notes | 2.5% Notes due 2030
Debt Instrument [Line Items]
Stated interest rate	2.50%	2.50%
Long-term debt, gross	$ 159						160
Effective interest rate	2.562%	2.562%
Senior Notes | 2024 Notes
Debt Instrument [Line Items]
Stated interest rate	3.375%	3.375%
Long-term debt, gross	$ 1,000						$ 1,000
Effective interest rate	3.484%	3.484%
Senior Notes | 2015 Euro Notes
Debt Instrument [Line Items]
Long-term debt, gross | €		€ 950									€ 1,650

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