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Debt - Components of Debt (Parenthetical) (Details) € in Millions, $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Debt Instrument [Line Items]
Financing obligation	$ 95		$ 55
Build-to-suit lease liability			55
Discovery Hub [Member]
Debt Instrument [Line Items]
Financing obligation	95
Senior Secured Tranche B-2 Euro Term Loan Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	383	€ 344	396	€ 347
6.625% Senior Unsecured Notes Due May 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 908		$ 908
Debt instrument interest rate	6.625%	6.625%	6.625%	6.625%
7.000% Senior Unsecured Notes Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 750		$ 750
Debt instrument interest rate	7.00%	7.00%	7.00%	7.00%
5.375% Senior Unsecured Notes Due May 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500		$ 500
Debt instrument interest rate	5.375%	5.375%	5.375%	5.375%
4.000% Senior Unsecured Notes Due May 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 501	€ 450	$ 513	€ 450
Debt instrument interest rate	4.00%	4.00%	4.00%	4.00%

X

- Definition

Build-to-suit lease liability.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Financing obligation.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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