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Fair Value Measurements - Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 02, 2020	Dec. 31, 2019
4.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes	4.375%
5.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes	5.375%
4.875% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes	4.875%
1.125% Convertible notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes	1.125%
Senior notes | 4.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes		4.375%
Senior notes | 5.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes	5.375%
Senior notes | 4.875% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes	4.875%
Convertible debt | 1.125% Convertible notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on notes	1.125%		1.125%
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	$ 1,813		$ 1,255
Carrying Amount | Senior notes | 4.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	789		0
Carrying Amount | Senior notes | 5.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	697		696
Carrying Amount | Senior notes | 4.875% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	327		327
Carrying Amount | Term loan facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	0		220
Carrying Amount | Convertible debt | 1.125% Convertible notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	0		12
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	1,884		1,347
Fair Value | Senior notes | 4.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	816		0
Fair Value | Senior notes | 5.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	731		745
Fair Value | Senior notes | 4.875% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	337		340
Fair Value | Term loan facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	0		220
Fair Value | Convertible debt | 1.125% Convertible notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	$ 0		$ 42

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- 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=120391452&loc=d3e13212-122682

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+ References

No definition available.

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