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Financing arrangements (Debt Repayments) (Details) € in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | $ 1,121 |  | $ 4,405 | $ 3,725
Repayments of short-term debt |  |  | 605 |
Notes [Member] | 6.15% notes due 2018 (6.15% 2018 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | $ 500 |  |  |
Interest rate, stated percentage | 6.15% | 6.15% |  |
Notes [Member] | 4.375% euro-denominated notes due 2018 (4.375% 2018 euro Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | $ 621 | € 550 |  |
Interest rate, stated percentage | 4.375% | 4.375% |  |
Notes [Member] | 2.125% notes due 2017 (2.125% 2017 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 1,250 |
Interest rate, stated percentage |  |  | 2.125% |
Notes [Member] | Floating rate notes due 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 600 |
Notes [Member] | 1.25% notes due 2017 (1.25% 2017 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 850 |
Interest rate, stated percentage |  |  | 1.25% |
Notes [Member] | 5.85% notes due 2017 (5.85% 2017 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 1,100 |
Interest rate, stated percentage |  |  | 5.85% |
Notes [Member] | 2.30% notes due 2016 (2.30% 2016 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  |  | $ 750
Interest rate, stated percentage |  |  |  | 2.30%
Notes [Member] | 2.50% notes due 2016 (2.50% 2016 Notes) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  |  | $ 1,000
Interest rate, stated percentage |  |  |  | 2.50%
Term loan due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  |  | $ 1,975

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