Consolidating Financial Information - Textual (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015	May 31, 2016
Additional Consolidating Financial Information (Textuals) [Abstract]
Total long term debt excluding capital leases	$ 6,047	$ 5,611
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]
Long-term debt, gross	$ 282
Total long term debt excluding capital leases	$ 272	$ 271
Interest rate, stated percentage	8.75%	8.75%
Debt instrument, maturity date	Aug. 15, 2020
5% due 2026 \| Senior Notes
Additional Consolidating Financial Information (Textuals) [Abstract]
Total long term debt excluding capital leases	$ 900	$ 0
Interest rate, stated percentage	5.00%	5.00%	5.00%
Debt instrument, maturity date	Mar. 01, 2026
7% due 2022 \| Senior Notes
Additional Consolidating Financial Information (Textuals) [Abstract]
Total long term debt excluding capital leases	$ 700	$ 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]
Total long term debt excluding capital leases	$ 1,000	$ 1,000
Interest rate, stated percentage	5.125%	5.125%
Debt instrument, maturity date	Nov. 15, 2023

Additional consolidating financial information.

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Consolidating financial information.

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Percentage of ownership over guarantor subsidiaries.

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No definition available.

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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

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-Publisher FASB
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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.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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.

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