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Financing arrangements (Debt Issuances) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Aggregate principal amount of notes issued | $ 4,500,000,000 | $ 6,700,000,000 | $ 3,500,000,000
Short-term loan | 0 | $ 605,000,000 |
Commercial paper, repayment | $ 605,000,000 |  |
1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 1.90% |  |
2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.20% |  |
2.65% notes due 2022 (2.65% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.65% |  |
3.20% notes due 2027 (3.20% 2027 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.20% |  |
1.85% notes due 2021 (1.85% 2021 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 1.85% | 1.85% |
1.25% notes due 2022 (1.25% 2022 euro Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 1.25% | 1.25% |
0.41% 2023 Swiss franc Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 0.41% | 0.41% |
2.25% notes due 2023 (2.25% 2023 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.25% | 2.25% |
2.00% 2026 euro Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.00% | 2.00% |
2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.60% | 2.60% |
4.40% notes due 2045 (4.40% 2045 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount of notes issued |  | $ 1,000,000,000 | $ 1,250,000,000.00
Stated contractual interest rate on note | 4.40% | 4.40% | 4.40%
2.125% notes due 2020 (2.125% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.125% |  | 2.125%
2.70% notes due 2022 (2.70% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.70% |  | 2.70%
3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.125% |  | 3.125%
Senior notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, unamortized premium |  | $ 79,000,000 |
Commercial Paper [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Commercial paper, maximum borrowing capacity | $ 2,500,000,000 |  |
Commercial paper, issued | 12,300,000,000 |  |
Commercial paper, maximum outstanding | 1,500,000,000.0 |  |
Commercial paper, repayment | $ 12,300,000,000 |  |

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