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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 | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 CHF (SFr) | Sep. 30, 2018 GBP (£)
--- | --- | --- | --- | ---
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 | 747 |  |  | £ 475
4.00% 2029 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amounts | $ 1,111 |  |  | £ 700
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%

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- 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 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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