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Long-Term Debt and Short-Term Borrowings - Long-Term Debt (Details) € in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Oct. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | May 31, 2016 EUR (€) | Aug. 31, 2015 USD ($) | May 31, 2015 EUR (€) | Nov. 30, 2014 EUR (€) | Jun. 30, 2014 USD ($) | Dec. 31, 2004 USD ($)
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Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | $ 13,198.0 |  |  | $ 11,478.0 |  |  |  |  |  |  |
Long-term debt (excluding current portion) | 12,096.0 |  |  | 10,678.0 |  |  |  |  |  |  |
Fixed rate medium term note due 2017 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  | 649.0 |  |  |  |  |  |  |
Floating rate Euro Medium term note due 2018 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 500.0 |  |  |  |  |  |  |  |  |
Total long-term debt | 600.0 |  |  | 523.0 |  |  |  |  |  |  |
Floating rate medium term note due 2018 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 450.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.50% | 1.50% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 448.0 |  |  | 448.0 |  |  |  |  |  |  |
Floating rate medium term note due 2019 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 600.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.63% | 1.63% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 596.0 |  |  | 598.0 |  |  |  |  |  |  |
Fixed rate medium term note due 2019 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 25.0 |  |  |  |  |  |  |  |  | $ 625.0 |
Interest rate - effective | 1.74% | 1.74% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 25.0 |  |  | 25.0 |  |  |  |  |  |  |
Floating rate Euro medium term note due 2020 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 650.0 |  |  |  |  |  |  |  |  |
Total long-term debt | 779.0 |  |  | 680.0 |  |  |  |  |  |  |
Floating rate medium term note due 2020 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 300.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.58% | 1.58% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 296.0 |  |  | 297.0 |  |  |  |  |  |  |
Fixed rate medium term note due 2020 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 200.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.49% | 1.49% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 198.0 |  |  | 199.0 |  |  |  |  |  |  |
Floating rate Eurobond Due 2021 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 300.0 |  |  |  |  |  |  |  |  |
Total long-term debt | $ 378.0 |  |  | 336.0 |  |  |  |  |  |  |
Fixed rate Eurobond Due 2021 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 300.0 |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.97% | 1.97% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 358.0 |  |  | 312.0 |  |  |  |  |  |  |
Fixed rate medium term notes due 2021 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 600.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.63% | 1.63% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 598.0 |  |  | 598.0 |  |  |  |  |  |  |
Fixed rate euro medium term note due February 2022 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 500.0 |  |  |  |  |  |  |  |  |
Interest rate - effective | 0.45% | 0.45% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 597.0 |  |  | 520.0 |  |  |  |  |  |  |
Fixed rate medium term note due 2022 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 600.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 2.17% | 2.17% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 595.0 |  |  | 593.0 |  |  |  |  |  |  |
Fixed rate Euro medium term note due 2023 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 600.0 |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.14% | 1.14% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 712.0 |  |  | 619.0 |  |  |  |  |  |  |
Fixed rate medium term notes due 2023 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 650.0 |  | $ 650.0 |  |  |  |  |  |  |  |
Interest rate - effective | 2.26% | 2.26% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 647.0 |  |  |  |  |  |  |  |  |  |
Fixed rate medium term note due 2025 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 550.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 3.04% | 3.04% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 546.0 |  |  | 546.0 |  |  |  |  |  |  |
Fixed rate Euro Medium term note due 2026 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 750.0 |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.71% | 1.71% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 885.0 |  |  | 770.0 |  |  |  |  |  |  |
Fixed rate medium term notes due 2026 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 650.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 2.25% | 2.25% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 641.0 |  |  | 640.0 |  |  |  |  |  |  |
Fixed rate medium term notes due 2027 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 850.0 |  | 850.0 |  |  |  |  |  |  |  |
Interest rate - effective | 2.95% | 2.95% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 839.0 |  |  |  |  |  |  |  |  |  |
Fixed rate 30-year debenture due 2028 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 220.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 6.01% | 6.01% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 227.0 |  |  | 342.0 |  |  |  |  |  |  |
Fixed rate Euro medium term note due 2030 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 500.0 |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.90% | 1.90% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 589.0 |  |  | 512.0 |  |  |  |  |  |  |
Fixed rate euro medium term note due 2031 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 500.0 |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.54% | 1.54% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 595.0 |  |  | 518.0 |  |  |  |  |  |  |
Fixed rate 30-year bond due 2037 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 555.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 5.73% | 5.73% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 550.0 |  |  | 743.0 |  |  |  |  |  |  |
Floating rate note due 2041 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 96.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.29% | 1.29% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 95.0 |  |  | 96.0 |  |  |  |  |  |  |
Fixed rate medium term note due 2044 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 325.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 4.05% | 4.05% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 313.0 |  |  | 313.0 |  |  |  |  |  |  |
Floating rate note due 2044 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 55.0 |  |  |  |  |  |  |  |  |  | $ 60.0
Interest rate - effective | 1.21% | 1.21% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 54.0 |  |  | 54.0 |  |  |  |  |  |  |
Fixed rate medium term notes due 2046 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 500.0 |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 3.13% | 3.13% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 473.0 |  |  | 473.0 |  |  |  |  |  |  |
Fixed rate medium term notes due 2047 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 500.0 |  | $ 500.0 |  |  |  |  |  |  |  |
Interest rate - effective | 3.68% | 3.68% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 491.0 |  |  |  |  |  |  |  |  |  |
Various fixed and floating rate Other borrowings due 2018-2040 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.26% | 1.26% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 73.0 |  |  | 74.0 |  |  |  |  |  |  |
May 2016 Euro medium term notes issued |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  |  |  |  |  | € 1,000.0 |  |  |  |  |
September 2016 medium term notes issued |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 1,750.0 |  |  |  |  |  |
May 2015 Euro medium term notes issued |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  |  |  |  |  |  |  | € 1,750.0 |  |  |
August 2015 medium term notes issued |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 1,500.0 |  |  |  |
June 2014 medium term notes issued |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 950.0 |
November 2014 Euro medium term notes issued |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  |  |  |  |  |  |  |  | € 1,250.0 |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate - effective | 0.67% | 0.67% |  |  |  |  |  |  |  |  |
Total long-term debt | $ 1,102.0 |  |  | $ 800.0 |  |  |  |  |  |  |

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