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Financing arrangements (Debt Issuances) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Short-term loan |  |  |  |  | $ 605,000,000
Commercial paper, maximum borrowing capacity |  | $ 2,500,000,000 |  |  |
Commercial paper issued | $ 12,300,000,000 |  |  |  |
Commercial paper repaid | 12,300,000,000 |  |  |  |
Commercial paper, maximum outstanding | 1,500,000,000.0 |  |  |  |
0.41% 2023 Swiss franc Bonds [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 0.41% | 0.41% | 0.41% |
Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of notes issued | $ 4,500,000,000 |  |  |  | $ 6,700,000,000
Notes [Member] | 1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 1.90% | 1.90% | 1.90% | 1.90% |
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 2.20% | 2.20% | 2.20% | 2.20% |
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 2.65% | 2.65% | 2.65% | 2.65% |
Notes [Member] | 3.20% notes due 2027 (3.20% 2027 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 3.20% | 3.20% | 3.20% | 3.20% |
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 1.85% | 1.85% | 1.85% | 1.85%
Notes [Member] | 1.25% notes due 2022 (1.25% 2022 euro Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of notes issued | € |  |  | € 1,250,000,000 |  |
Interest rate, stated percentage |  | 1.25% | 1.25% | 1.25% | 1.25%
Notes [Member] | 0.41% 2023 Swiss franc Bonds [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of notes issued | SFr |  |  |  | SFr 700,000,000 |
Interest rate, stated percentage |  | 0.41% | 0.41% | 0.41% | 0.41%
Notes [Member] | 2.25% notes due 2023 (2.25% 2023 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 2.25% | 2.25% | 2.25% | 2.25%
Notes [Member] | 2.00% 2026 euro Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of notes issued | € |  |  | € 750,000,000 |  |
Interest rate, stated percentage |  | 2.00% | 2.00% | 2.00% | 2.00%
Notes [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 2.60% | 2.60% | 2.60% | 2.60%
Notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of notes issued |  |  |  |  | $ 1,000,000,000
Interest rate, stated percentage |  | 4.40% | 4.40% | 4.40% | 4.40%
Debt instrument, unamortized premium |  |  |  |  | $ 79,000,000

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