Consolidating Financial Information - Textual (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Consolidating Financial Information (Textuals) [Abstract]
Percentage of ownership over guarantor subsidiaries	100.00%
Guarantor obligations, related party disclosure	The notes are fully and unconditionally guaranteed on a joint and several basis by each guarantor subsidiary.
Purchase of common shares of a non-quarantor subsidiary		$ 145
Capitalization of intercompany receivables for increase in equity of subsidiary		$ 90
Non-guarantor subsidiaries, restrictions on remittance of funds	Certain non-guarantor subsidiaries of the Parent Company are limited in their ability to remit funds to it by means of dividends, advances or loans due to required foreign government and/or currency exchange board approvals or limitations in credit agreements or other debt instruments of those subsidiaries.
8.75% due 2020 \| Senior Notes
Additional Consolidating Financial Information (Textuals) [Abstract]
Debt instrument, outstanding principal amount	$ 282
Interest rate, stated percentage	8.75%	8.75%
Debt instrument, maturity date	Aug. 15, 2020
6.5% due 2021 \| Senior Notes
Additional Consolidating Financial Information (Textuals) [Abstract]
Debt instrument, outstanding principal amount	$ 900
Interest rate, stated percentage	6.50%	6.50%
Debt instrument, maturity date	Mar. 01, 2021
7% due 2022 \| Senior Notes
Additional Consolidating Financial Information (Textuals) [Abstract]
Debt instrument, outstanding principal amount	$ 700
Interest rate, stated percentage	7.00%	7.00%
Debt instrument, maturity date	May 15, 2022
5.125% due 2023 \| Senior Notes
Additional Consolidating Financial Information (Textuals) [Abstract]
Debt instrument, outstanding principal amount	$ 1,000
Interest rate, stated percentage	5.125%	5.125%
Debt instrument, maturity date	Nov. 15, 2023

Additional consolidating financial information.

No definition available.

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Consolidating financial information.

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No definition available.

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- Definition

Percentage of ownership over guarantor subsidiaries.

+ References

No definition available.

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- Definition

Represents a (noncash) issuance of additional equity interests to the parent by a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4M
-URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591554-111686

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
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- Definition

Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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- Definition

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

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-Name Accounting Standards Codification
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.22(a)(1))
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher FASB
-Name Accounting Standards Codification
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Describes certain required disclosures for those guarantees that are issued to benefit entities meeting the definition of a related party.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The description of the nature of any restrictions on the ability of consolidated and unconsolidated subsidiaries to transfer funds to the parent in the form of cash dividends, loans and advances.

+ References

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-Subparagraph (SX 210.4-08.(e)(3)(i))
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