Long-term Debt - Summary of Long-term Debt (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal amount at par	$ 3,400,000,000
Senior Notes \| 4.375% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	1,000,000,000
Fair value	$ 986,000,000	$ 975,000,000
Interest rate	4.375%
Senior Notes \| 5.50% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	$ 700,000,000
Fair value	$ 745,000,000	758,000,000
Interest rate	5.50%
Senior Notes \| 5.875% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	$ 800,000,000
Fair value	$ 860,000,000	868,000,000
Interest rate	5.875%
Senior Notes \| 5.750% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	$ 400,000,000
Fair value	$ 429,000,000	431,000,000
Interest rate	5.75%
Senior Notes \| 5.375% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	$ 500,000,000
Fair value	$ 535,000,000	$ 539,000,000
Interest rate	5.375%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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- 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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- Definition

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.

+ References

No definition available.

+ Details

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Period Type:	instant

- Details

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- Details

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