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Credit Facilities and Debt (Textuals) (Details) |  |  | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2020 USD ($) | Sep. 20, 2011 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 03, 2019 EUR (€) | Mar. 05, 2019 USD ($) | Jan. 26, 2018 USD ($) | Oct. 11, 2016 USD ($) | Mar. 11, 2016 USD ($) | Mar. 11, 2016 EUR (€)
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 101.00% |  |  |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 592,000,000 |  |  |
Senior Notes Due 2021, 4.875% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Fair value of senior notes due |  |  |  | $ 606,000,000 | $ 620,000,000 |  |  |  |  |  |
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 |  |  |  | 614,000,000 | 640,000,000 |  |  |  |  |  |
Senior Notes Due | [1] |  |  | 592,000,000 | 612,000,000 |  |  |  |  |  |
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 |  |  |  | 548,000,000 | 563,000,000 |  |  |  |  |  |
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 |  |  |  | 483,000,000 | 496,000,000 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.375% |  |
Senior Notes Due | [1] |  |  | $ 400,000,000 | 400,000,000 |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 400,000,000 |  |
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 |  |  |  |  |  |  |
Euro Commercial Paper Program |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  | € 500,000,000 |  |  |  |  |
Senior Notes Due Twenty Twenty Eight |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Fair value of senior notes due |  |  |  | 508,000,000 | 529,000,000 |  |  |  |  |  |
Interest rate |  | 1.95% |  |  |  |  |  |  |  |  |
Senior Notes Due |  |  |  | 500,000,000 | 500,000,000 |  |  |  |  |  |
Face amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Senior Notes Due Twenty Thirty One |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Fair value of senior notes due |  |  |  | 507,000,000 | 527,000,000 |  |  |  |  |  |
Interest rate |  | 2.25% |  |  |  |  |  |  |  |  |
Senior Notes Due |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |  |  |
Face amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Green Bond | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 101.00% |  |  |  |  |  |  |  |  |
[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 $606 million and $620 million as of June 30, 2021 and December 31, 2020, respectively. The fair value of our Senior Notes due 2023 was $614 million and $640 million as of June 30, 2021 and December 31, 2020, respectively. The fair value of our Senior Notes due 2026 was $548 million and $563 million as of June 30, 2021 and December 31, 2020 respectively. The fair value of our Senior Notes due 2046 was $483 million and $496 million as of June 30, 2021 and December 31, 2020, respectively.(b)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 2028 was $508 million and $529 million as of June 30, 2021 and December 31, 2020, respectively. The fair value of our Senior Notes due 2031 was $507 million and $527 million as of June 30, 2021 and December 31, 2020, respectively.

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