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Derivative instruments (Cross-currency Swaps) (Details) - Cash flow hedge [Member] - Cross-currency swap contracts [Member] € in Millions, £ in Millions, SFr in Millions, $ in Millions	Mar. 31, 2019 GBP (£)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 CHF (SFr)	Mar. 31, 2019 EUR (€)
2.125% 2019 euro Notes [Member]
Derivative [Line Items]
Notional amounts		$ 864		€ 675
1.25% 2022 euro Notes [Member]
Derivative [Line Items]
Notional amounts		1,388		1,250
0.41% 2023 Swiss franc Bonds [Member]
Derivative [Line Items]
Notional amounts		704	SFr 700
2.00% 2026 euro Notes [Member]
Derivative [Line Items]
Notional amounts		833		€ 750
5.50% 2026 pound sterling Notes [Member]
Derivative [Line Items]
Notional amounts	£ 475	747
4.00% 2029 pound sterling Notes [Member]
Derivative [Line Items]
Notional amounts	£ 700	$ 1,111
Euro Member Countries, Euro | 2.125% 2019 euro Notes [Member]
Derivative [Line Items]
Interest rates	2.125%	2.125%	2.125%	2.125%
Euro Member Countries, Euro | 1.25% 2022 euro Notes [Member]
Derivative [Line Items]
Interest rates	1.25%	1.25%	1.25%	1.25%
Euro Member Countries, Euro | 2.00% 2026 euro Notes [Member]
Derivative [Line Items]
Interest rates	2.00%	2.00%	2.00%	2.00%
Switzerland, Francs | 0.41% 2023 Swiss franc Bonds [Member]
Derivative [Line Items]
Interest rates	0.41%	0.41%	0.41%	0.41%
United Kingdom, Pounds | 5.50% 2026 pound sterling Notes [Member]
Derivative [Line Items]
Interest rates	5.50%	5.50%	5.50%	5.50%
United Kingdom, Pounds | 4.00% 2029 pound sterling Notes [Member]
Derivative [Line Items]
Interest rates	4.00%	4.00%	4.00%	4.00%
United States of America, Dollars | 2.125% 2019 euro Notes [Member]
Derivative [Line Items]
Interest rates	2.60%	2.60%	2.60%	2.60%
United States of America, Dollars | 1.25% 2022 euro Notes [Member]
Derivative [Line Items]
Interest rates	3.20%	3.20%	3.20%	3.20%
United States of America, Dollars | 0.41% 2023 Swiss franc Bonds [Member]
Derivative [Line Items]
Interest rates	3.40%	3.40%	3.40%	3.40%
United States of America, Dollars | 2.00% 2026 euro Notes [Member]
Derivative [Line Items]
Interest rates	3.90%	3.90%	3.90%	3.90%
United States of America, Dollars | 5.50% 2026 pound sterling Notes [Member]
Derivative [Line Items]
Interest rates	6.00%	6.00%	6.00%	6.00%
United States of America, Dollars | 4.00% 2029 pound sterling Notes [Member]
Derivative [Line Items]
Interest rates	4.50%	4.50%	4.50%	4.50%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

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+ References

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