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Debt (Summary of Outstanding Debt) (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Apr. 30, 2018 USD ($) | Apr. 30, 2018 EUR (€) | Jan. 31, 2018 USD ($) | Jan. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€)
Principal outstanding |  |  |  |  |  |  |  |
Short-term debt | $ 89,000,000 |  |  |  |  |  | $ 62,000,000 |
Total long-term debt | 8,696,000,000 |  |  |  |  |  | 5,328,000,000 |
Capital lease obligations | 29,000,000 |  |  |  |  |  | 29,000,000 |
Less: current maturities | (86,000,000) |  |  |  |  |  | (64,000,000) |
Total long-term debt, less current maturities | 8,610,000,000 |  |  |  |  |  | 5,264,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Short-term debt | 89,000,000 |  |  |  |  |  | 62,000,000 |
Total long-term debt | 8,603,000,000 |  |  |  |  |  | 5,281,000,000 |
Capital lease obligations | 29,000,000 |  |  |  |  |  | 29,000,000 |
Less: current maturities | (86,000,000) |  |  |  |  |  | (64,000,000) |
Total long-term debt, less current maturities | 8,517,000,000 |  |  |  |  |  | 5,217,000,000 |
Revolving credit facilities |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | 0 |  |  |  |  |  | 122,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | 0 |  |  |  |  |  | 122,000,000 |
Term loan facilities | U.S. dollar at LIBOR plus 1.75% due 2022 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | 815,000,000 |  |  |  |  |  | 741,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 810,000,000 |  |  |  |  |  | 735,000,000 |
Term loan facilities | U.S. dollar at LIBOR plus 1.75% due 2022 | LIBOR |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |  |  |  |
Term loan facilities | U.S. dollar at LIBOR plus 2.00% due 2025 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 887,000,000 |  |  |  |  |  | 0 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 864,000,000 |  |  |  |  |  | 0 |
Debt instrument, face amount |  |  | $ 1,150,000,000 |  |  |  |  |
Term loan facilities | U.S. dollar at LIBOR plus 2.00% due 2025 | LIBOR |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.00% |  |  |  |  |  |  |
Term loan facilities | Euro at EURIBOR plus 1.75% due 2022 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 301,000,000 |  |  |  |  |  | 324,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 301,000,000 |  |  |  |  |  | 324,000,000 |
Debt instrument, face amount | € |  | € 263,000,000 |  |  |  |  |  | € 270,000,000
Term loan facilities | Euro at EURIBOR plus 1.75% due 2022 | EURIBOR |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |  |  |  |
Term loan facilities | Euro at EURIBOR plus 2.375% due 2025 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 855,000,000 | € 746,000,000 |  |  |  |  | 0 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | 846,000,000 |  |  |  |  |  | 0 |
Debt instrument, face amount | $ 859,000,000 |  |  | € 750,000,000 |  |  |  |
Term loan facilities | Euro at EURIBOR plus 2.375% due 2025 | EURIBOR |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.375% |  |  |  |  |  |  |
Senior notes and debentures: | €650 at 4.0% due 2022 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 745,000,000 |  |  |  |  |  | 781,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 740,000,000 |  |  |  |  |  | 774,000,000 |
Debt instrument stated percentage | 4.00% | 4.00% |  |  |  |  |  |
Debt instrument, face amount | € |  | € 650,000,000 |  |  |  |  |  |
Senior notes and debentures: | U. S. dollar at 4.50% due 2023 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 1,000,000,000 |  |  |  |  |  | 1,000,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 993,000,000 |  |  |  |  |  | 992,000,000 |
Debt instrument stated percentage | 4.50% | 4.50% |  |  |  |  |  |
Senior notes and debentures: | €335 at 2.25% due 2023 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 384,000,000 |  |  |  |  |  | 0 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 380,000,000 |  |  |  |  |  | 0 |
Debt instrument stated percentage | 2.25% | 2.25% |  |  | 2.25% | 2.25% |  |
Debt instrument, face amount | $ 384,000,000 | € 335,000,000 |  |  |  | € 335,000,000 |  |
Senior notes and debentures: | €600 at 2.625% due 2024 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | 688,000,000 |  |  |  |  |  | 720,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 682,000,000 |  |  |  |  |  | 713,000,000 |
Debt instrument stated percentage | 2.625% | 2.625% |  |  |  |  |  |
Debt instrument, face amount | € |  | € 600,000,000 |  |  |  |  |  |
Senior notes and debentures: | €600 at 3.375% due 2025 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 688,000,000 |  |  |  |  |  | 720,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 681,000,000 |  |  |  |  |  | 711,000,000 |
Debt instrument stated percentage | 3.375% | 3.375% |  |  |  |  |  |
Debt instrument, face amount | € |  | € 600,000,000 |  |  |  |  |  |
Senior notes and debentures: | U.S. dollar at 4.25% due 2026 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 400,000,000 |  |  |  |  |  | 400,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 394,000,000 |  |  |  |  |  | 393,000,000 |
Debt instrument stated percentage | 4.25% | 4.25% |  |  |  |  |  |
Senior notes and debentures: | U.S. dollar at 4.75% due 2026 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 875,000,000 |  |  |  |  |  | 0 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 863,000,000 |  |  |  |  |  | 0 |
Debt instrument stated percentage | 4.75% | 4.75% |  |  | 4.75% | 4.75% |  |
Debt instrument, face amount |  |  |  |  | $ 875,000,000 |  |  |
Senior notes and debentures: | U.S. dollar at 7.375% due 2026 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 350,000,000 |  |  |  |  |  | 350,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 348,000,000 |  |  |  |  |  | 347,000,000 |
Debt instrument stated percentage | 7.375% | 7.375% |  |  |  |  |  |
Senior notes and debentures: | €500 at 2.875% due 2026 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 573,000,000 |  |  |  |  |  | 0 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 566,000,000 |  |  |  |  |  | 0 |
Debt instrument stated percentage | 2.875% | 2.875% |  |  | 2.875% | 2.875% |  |
Debt instrument, face amount | $ 573,000,000 | € 500,000,000 |  |  |  | € 500,000,000 |  |
Senior notes and debentures: | U.S. dollar at 7.50% due 2096 |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | 40,000,000 |  |  |  |  |  | 40,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 40,000,000 |  |  |  |  |  | 40,000,000 |
Debt instrument stated percentage | 7.50% | 7.50% |  |  |  |  |  |
Other indebtedness, fixed rate |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 62,000,000 |  |  |  |  |  | 96,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 62,000,000 |  |  |  |  |  | 96,000,000 |
Other indebtedness, fixed rate | Minimum |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |
Debt instrument stated percentage | 4.00% | 4.00% |  |  |  |  |  |
Other indebtedness, fixed rate | Maximum |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |
Debt instrument stated percentage | 7.50% | 7.50% |  |  |  |  |  |
Other indebtedness, variable rate |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |
Total long-term debt | $ 4,000,000 |  |  |  |  |  | 5,000,000 |
Carrying amount |  |  |  |  |  |  |  |
Total long-term debt | $ 4,000,000 |  |  |  |  |  | $ 5,000,000 |
Average variable rates | 4.30% | 4.30% |  |  |  |  |  |

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