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Financing arrangements (Details Textual) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Debt repayment, short-term loan |  | $ 605,000,000 |  |
Debt repayment, long-term debt |  | $ 4,405,000,000 | $ 2,725,000,000 |
Debt, principal amount | $ 3,500,000,000.0 |  |  |
4.563% notes due 2048 (4.563% 2048 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 4.563% |  |
Effective interest rate |  | 6.30% |  |
4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 4.663% |  |
Effective interest rate |  | 5.60% |  |
2.125% notes due 2017 (2.125% 2017 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 2.125% |  | 2.125%
Debt repayment, long-term debt |  | $ 1,250,000,000 |  |
Floating Rate Notes due 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt repayment, long-term debt |  | $ 600,000,000 |  |
1.25% notes due 2017 (1.25% 2017 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 1.25% |  | 1.25%
Debt repayment, long-term debt |  | $ 850,000,000 |  |
5.85% notes due 2017 (5.85% 2017 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 5.85% |  | 5.85%
Debt repayment, long-term debt |  | $ 1,100,000,000 |  |
1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 1.90% | 1.90% |  |
2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.20% | 2.20% |  |
2.65% notes due 2022 (2.65% 2022 Notes) {Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.65% | 2.65% |  |
Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption period without payment of a make-whole amount | 1 month |  |  |
Commercial paper [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average effective borrowing rate |  | 1.30% |  |

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