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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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