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Long-Term Debt and Short-Term Borrowings - Long-Term Debt (Details) € in Millions, $ in Millions | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | May 31, 2016 EUR (€) | Jun. 30, 2014 USD ($) | Dec. 31, 2004 USD ($)
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Long-Term Debt |  |  |  |  |  |  |  |  |
Total long-term debt |  | $ 14,156 |  | $ 13,198 |  |  |  |  |
Long-term debt (excluding current portion) |  | 13,411 |  | 12,096 |  |  |  |  |
Floating rate Euro medium term note due 2018 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  | 600 |  |  |  |  |
Floating rate medium term note due 2018 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  | 448 |  |  |  |  |
Floating rate medium term note due 2019 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600 |  |  |  |  |  |  |
Interest rate - effective | 1.74% | 1.74% |  |  |  |  |  |  |
Total long-term debt |  | $ 596 |  | 596 |  |  |  |  |
Fixed rate medium term note due 2019 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 25 |  |  |  |  |  | $ 625 |
Interest rate - effective | 1.74% | 1.74% |  |  |  |  |  |  |
Total long-term debt |  | $ 25 |  | 25 |  |  |  |  |
Floating rate Euro medium term note due 2020 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 650 |  |  |  |  |  |  |  |
Total long-term debt |  | 743 |  | 779 |  |  |  |  |
Floating rate medium term note due 2020 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 300 |  |  |  |  |  |  |
Interest rate - effective | 2.61% | 2.61% |  |  |  |  |  |  |
Total long-term debt |  | $ 294 |  | 296 |  |  |  |  |
Floating rate medium term note due 2020 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 200 |  |  |  |  |  |  |
Interest rate - effective | 2.69% | 2.69% |  |  |  |  |  |  |
Total long-term debt |  | $ 197 |  | 198 |  |  |  |  |
Floating rate Eurobond due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 300 |  |  |  |  |  |  |  |
Total long-term debt |  | $ 357 |  | 378 |  |  |  |  |
Fixed rate Eurobond due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 300 |  |  |  |  |  |  |  |
Interest rate - effective | 1.97% | 1.97% |  |  |  |  |  |  |
Total long-term debt |  | $ 341 |  | 358 |  |  |  |  |
Fixed rate medium term note due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600 |  |  |  |  |  |  |
Interest rate - effective | 1.63% | 1.63% |  |  |  |  |  |  |
Total long-term debt |  | $ 599 |  | 598 |  |  |  |  |
Fixed rate medium term note due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 200 |  |  |  |  |  |  |
Interest rate - effective | 3.07% | 3.07% |  |  |  |  |  |  |
Total long-term debt |  | $ 199 |  |  |  |  |  |  |
Floating rate medium term notes due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 200 |  |  |  |  |  |  |
Interest rate - effective | 3.07% | 3.07% |  |  |  |  |  |  |
Total long-term debt |  | $ 201 |  |  |  |  |  |  |
Fixed rate Euro medium term note due 2022 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 500 |  |  |  |  |  |  |  |
Interest rate - effective | 0.45% | 0.45% |  |  |  |  |  |  |
Total long-term debt |  | $ 570 |  | 597 |  |  |  |  |
Fixed rate medium term note due 2022 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600 |  |  |  |  |  |  |
Interest rate - effective | 2.17% | 2.17% |  |  |  |  |  |  |
Total long-term debt |  | $ 596 |  | 595 |  |  |  |  |
Fixed rate Euro medium term note due 2023 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 600 |  |  |  |  |  |  |  |
Interest rate - effective | 1.14% | 1.14% |  |  |  |  |  |  |
Total long-term debt |  | $ 680 |  | 712 |  |  |  |  |
Fixed rate medium term notes due 2023 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 650 |  |  | $ 650 |  |  |  |
Interest rate - effective | 2.26% | 2.26% |  |  | 2.25% |  |  |  |
Total long-term debt |  | $ 648 |  | 647 |  |  |  |  |
Floating rate medium term notes due 2024 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 300 | $ 300 |  |  |  |  |  |
Interest rate - effective | 2.91% | 2.91% |  |  |  |  |  |  |
Total long-term debt |  | $ 299 |  |  |  |  |  |  |
Fixed rate medium term notes due 2024 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 300 | $ 300 |  |  |  |  |  |
Interest rate - effective | 3.30% | 3.30% | 3.25% |  |  |  |  |  |
Total long-term debt |  | $ 298 |  |  |  |  |  |  |
Fixed rate medium term note due 2025 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 550 |  |  |  |  |  |  |
Interest rate - effective | 3.04% | 3.04% |  |  |  |  |  |  |
Total long-term debt |  | $ 547 |  | 546 |  |  |  |  |
Fixed rate Euro medium term note due 2026 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 750 |  |  |  |  |  |  |  |
Interest rate - effective | 1.65% | 1.65% |  |  |  |  |  |  |
Total long-term debt |  | $ 844 |  | 885 |  |  |  |  |
Fixed rate medium term notes due 2026 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 650 |  |  |  |  |  |  |
Interest rate - effective | 2.37% | 2.37% |  |  |  |  |  |  |
Total long-term debt |  | $ 642 |  | 641 |  |  |  |  |
Fixed rate medium term notes due 2027 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 850 |  |  | $ 850 |  |  |  |
Interest rate - effective | 2.95% | 2.95% |  |  | 2.875% |  |  |  |
Total long-term debt |  | $ 841 |  | 839 |  |  |  |  |
Fixed rate 30-year debenture due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 220 |  |  |  |  |  |  |
Interest rate - effective | 6.01% | 6.01% |  |  |  |  |  |  |
Total long-term debt |  | $ 226 |  | 227 |  |  |  |  |
Fixed rate medium term notes due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 600 | $ 600 |  |  |  |  |  |
Interest rate - effective | 3.62% | 3.62% | 3.625% |  |  |  |  |  |
Total long-term debt |  | $ 597 |  |  |  |  |  |  |
Fixed rate Euro medium term note due 2030 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 500 |  |  |  |  |  |  |  |
Interest rate - effective | 1.90% | 1.90% |  |  |  |  |  |  |
Total long-term debt |  | $ 562 |  | 589 |  |  |  |  |
Fixed rate Euro medium term notes due 2031 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € | € 500 |  |  |  |  |  |  |  |
Interest rate - effective | 1.54% | 1.54% |  |  |  |  |  |  |
Total long-term debt |  | $ 567 |  | 595 |  |  |  |  |
Fixed rate 30-year bond due 2037 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 555 |  |  |  |  |  |  |
Interest rate - effective | 5.73% | 5.73% |  |  |  |  |  |  |
Total long-term debt |  | $ 551 |  | 550 |  |  |  |  |
Floating rate note due 2041 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 96 |  |  |  |  |  |  |
Interest rate - effective | 2.45% | 2.45% |  |  |  |  |  |  |
Total long-term debt |  | $ 95 |  | 95 |  |  |  |  |
Fixed rate medium term note due 2044 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 325 |  |  |  |  |  |  |
Interest rate - effective | 4.05% | 4.05% |  |  |  |  |  |  |
Total long-term debt |  | $ 314 |  | 313 |  |  |  |  |
Floating rate note due 2044 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 55 |  |  |  |  |  |  | $ 60
Interest rate - effective | 2.43% | 2.43% |  |  |  |  |  |  |
Total long-term debt |  | $ 53 |  | 54 |  |  |  |  |
Fixed rate medium term note due 2046 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 500 |  |  |  |  |  |  |
Interest rate - effective | 3.37% | 3.37% |  |  |  |  |  |  |
Total long-term debt |  | $ 474 |  | 473 |  |  |  |  |
Fixed rate medium term note due 2047 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 500 |  |  | $ 500 |  |  |  |
Interest rate - effective | 3.68% | 3.68% |  |  | 3.625% |  |  |  |
Total long-term debt |  | $ 491 |  | 491 |  |  |  |  |
Fixed rate medium term note due 2048 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  | $ 650 | $ 650 |  |  |  |  |  |
Interest rate - effective | 4.07% | 4.07% | 4.00% |  |  |  |  |  |
Total long-term debt |  | $ 637 |  |  |  |  |  |  |
Various fixed and floating rate of other borrowings due 2019-2040 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Interest rate - effective | 2.35% | 2.35% |  |  |  |  |  |  |
Total long-term debt |  | $ 72 |  | 73 |  |  |  |  |
May 2016 Euro medium term notes issued |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € |  |  |  |  |  |  | € 1,000 |  |
September 2016 medium term notes issued |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,750 |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Interest rate - effective | 1.85% | 1.85% |  |  |  |  |  |  |
Total long-term debt |  | $ 745 |  | $ 1,102 |  |  |  |  |

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