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v3.20.1

Credit Facilities and Debt (Textuals) (Details) |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |
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Apr. 30, 2020 USD ($) | Mar. 19, 2020 EUR (€) | Sep. 20, 2011 USD ($) | Mar. 31, 2020 USD ($) | Apr. 25, 2020 EUR (€) | Apr. 25, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 29, 2019 EUR (€) | Nov. 29, 2019 USD ($) | Jun. 03, 2019 EUR (€) | Jun. 03, 2019 USD ($) | Mar. 05, 2019 USD ($) | Oct. 20, 2016 EUR (€) | Oct. 20, 2016 USD ($) | Oct. 11, 2016 USD ($) | Mar. 11, 2016 EUR (€) | Mar. 11, 2016 USD ($)
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2021, 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of senior notes due |  |  |  |  | $ 640,000,000 |  |  | $ 629,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due | [1] |  |  |  | 600,000,000 |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2023, 2.250% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of senior notes due |  |  |  |  | 565,000,000 |  |  | 591,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes Due | [1] |  |  |  | 547,000,000 |  |  | 557,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2023, 2.250% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25% | 2.25%
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 500,000,000 | $ 500,000,000
Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of senior notes due |  |  |  |  | 533,000,000 |  |  | 518,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
Senior Notes Due | [1] |  |  |  | 500,000,000 |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Senior Notes due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of senior notes due |  |  |  |  | 400,000,000 |  |  | 431,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.375% |  |
Senior Notes Due | [1] |  |  |  | $ 400,000,000 |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |
2015 Five-Year Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Five-Year Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |  |  |
Permitted increases in Credit Facility borrowing base |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |
Maximum permitted increases in Credit Facility borrowing base |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
US Dollar Commercial Paper Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due |  |  |  |  | 268,000,000 |  |  | 276,000,000 |  |  |  |  |  |  |  |  |  |
Euro Commercial Paper Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | € 500,000,000 | $ 547,000,000 |  |  |  |  |  |
Commercial Paper |  |  |  |  | $ 268,000,000 |  |  |  |  |  |  | $ 276,000,000 |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  | (0.21%) |  |  |  |  |  |  |  |  |  |  |  |  |
Uncommitted Short Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | € 110,000,000 | $ 120,000,000 |  |  |
Proceeds from Issuance of Unsecured Debt | € |  |  | € 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  | $ 120,000,000 |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Uncommitted Short Term Facility, BGL BNP Paribas Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | € 65,000,000 | $ 71,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt | € |  |  | € 65,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility | Subsequent Event | Adjusted LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility | Subsidiary | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | € 100,000,000 | $ 109,000,000 |  |  |  |  |  |  |  |  |  |  |
[1] | The fair value of our Senior Notes was determined using quoted prices in active markets for identical securities, which are considered Level 1 inputs. The fair value of our Senior Notes due 2021 was $640 million and $629 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2023 was $565 million and $591 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2026 was $533 million and $518 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2046 was $400 million and $431 million as of March 31, 2020 and December 31, 2019, respectively.

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