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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	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 GBP (£)
1.25% 2022 euro Notes [Member]
Derivative [Line Items]
Notional amount	$ 1,388	€ 1,250
0.41% 2023 Swiss franc Bonds [Member]
Derivative [Line Items]
Notional amount	704		SFr 700
2.00% 2026 euro Notes [Member]
Derivative [Line Items]
Notional amount	833	€ 750
5.50% 2026 pound sterling Notes [Member]
Derivative [Line Items]
Notional amount	747			£ 475
4.00% 2029 pound sterling Notes [Member]
Derivative [Line Items]
Notional amount	$ 1,111			£ 700
Euro Member Countries, Euro [Member] | 1.25% 2022 euro Notes [Member]
Derivative [Line Items]
Interest rates	1.30%	1.30%	1.30%	1.30%
Euro Member Countries, Euro [Member] | 2.00% 2026 euro Notes [Member]
Derivative [Line Items]
Interest rates	2.00%	2.00%	2.00%	2.00%
Switzerland, Francs [Member] | 0.41% 2023 Swiss franc Bonds [Member]
Derivative [Line Items]
Interest rates	0.40%	0.40%	0.40%	0.40%
United Kingdom, Pounds [Member] | 5.50% 2026 pound sterling Notes [Member]
Derivative [Line Items]
Interest rates	5.50%	5.50%	5.50%	5.50%
United Kingdom, Pounds [Member] | 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 [Member] | 1.25% 2022 euro Notes [Member]
Derivative [Line Items]
Interest rates	3.20%	3.20%	3.20%	3.20%
United States of America, Dollars [Member] | 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 [Member] | 2.00% 2026 euro Notes [Member]
Derivative [Line Items]
Interest rates	3.90%	3.90%	3.90%	3.90%
United States of America, Dollars [Member] | 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 [Member] | 4.00% 2029 pound sterling Notes [Member]
Derivative [Line Items]
Interest rates	4.50%	4.50%	4.50%	4.50%

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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