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Credit Facilities and Debt (Textuals) (Details)				3 Months Ended		12 Months Ended
		Mar. 27, 2015 USD ($)	Sep. 20, 2011 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017	Dec. 31, 2017 USD ($)	Jan. 26, 2018 USD ($)	Jan. 26, 2018 EUR (€)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 EUR (€)	Oct. 28, 2016 USD ($)	Oct. 28, 2016 EUR (€)	Oct. 11, 2016 USD ($)	Mar. 11, 2016 USD ($)	Mar. 11, 2016 EUR (€)
Debt Instrument
Commercial Paper				$ 600,000,000
Commercial paper outstanding						$ 0
Weighted average interest rate				2.32%		0.00%
Letter of Credit
Debt Instrument
Debt instrument aggregate principal amount		$ 100,000,000
Revolving Credit Facility
Debt Instrument
Term of debt		5 years
Debt instrument aggregate principal amount		$ 600,000,000
Permitted increases in Credit Facility borrowing base		200,000,000
Maximum permitted increases in Credit Facility borrowing base		$ 800,000,000
Interest rate per annum, effective rate				1.00%
Maximum leverage ratio					4.00
Maximum leverage ratio subsequent				3.50
European Investment Bank - Research and Development Finance Contract [Member]
Debt Instrument
Variable rate on debt				0.59%
Term of debt				11 years
Senior Notes
Debt Instrument
Redemption price percentage			101.00%
Line of Credit
Debt Instrument
Face amount							$ 279,000,000	€ 225,000,000			$ 130,000,000	€ 105,000,000
Senior Notes Due 2021, 4.875%
Debt Instrument
Fair value of senior notes due				$ 635,000,000		$ 648,000,000
Interest on notes due			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				666,000,000		638,000,000
Senior Notes Due	[1]			$ 620,000,000		597,000,000
Senior Notes Due 2023, 2.250% | Senior Notes
Debt Instrument
Interest on notes due														2.25%	2.25%
Face amount														$ 500,000,000	€ 500,000,000
Research and development facility agreement
Debt Instrument
Term of debt				5 years
Senior Notes due 2026
Debt Instrument
Fair value of senior notes due				$ 486,000,000		498,000,000
Interest on notes due													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				408,000,000		431,000,000
Interest on notes due													4.375%
Senior Notes Due	[1]			400,000,000		400,000,000
Face amount													$ 400,000,000
Research and development finance contract
Debt Instrument
Senior Notes Due				130,000,000		125,000,000
Term loan
Debt Instrument
Senior Notes Due				279,000,000		0
SEB Bank | Line of Credit
Debt Instrument
Face amount									$ 81,000,000	€ 65,000,000
Outstanding balance				$ 53,000,000		$ 0
[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 $635 million and $648 million as of March 31, 2018 and December 31, 2017, respectively. The fair value of our Senior Notes due 2023 was $666 million and $638 million as of March 31, 2018 and December 31, 2017, respectively. The fair value of our Senior Notes due 2026 was $486 million and $498 million as of March 31, 2018 and December 31, 2017, respectively.The fair value of our Senior Notes due 2046 was $408 million and $431 million as of March 31, 2018 and December 31, 2017, respectively.

X

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Line of credit basis off spread on variable rate.

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Line of Credit Facility, Increases in Maximum Borrowing Capacity

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Line of Credit Facility, Increases in Maximum Borrowing Capacity, Total

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Maximum leverage ratio.

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Maximum Leverage Ratio, Second Term

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Redemption price percentage.

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