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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Funding (Details) € in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 EUR (€)	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items]
Notional amount		$ 1,559			$ 1,557
Premium on bonds		63
Borrowings		$ 13,862			$ 15,027
Bonds due January 2023
Disclosure of detailed information about borrowings [line items]
Notional amount	$ 884		€ 750
Coupon rate	3.75%		3.75%
Premium on bonds	$ 63
Borrowings With Line Of Credit Member
Disclosure of detailed information about borrowings [line items]
Borrowings				$ 300
Borrowings With Line Of Credit Member | LIBOR
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis				2.49%

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

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- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

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- Definition

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

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- Definition

The amount of expenses incurred in connection with cash tender offer repurchased.

+ References

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