Debt - Long-Term Debt Table (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 9,400	$ 9,981
Long-term Debt, Gross	9,377	9,973
Debt issuance costs	(60)	(63)
Debt, current	(53)	(53)
Current maturities of long-term debt, net	(52)	(52)
Long-term debt, fair value	9,347	9,928
Long-term debt, net	9,325	9,921
Interest rate contract [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	0	0
Interest rate derivatives	2	2
Senior notes [Member] \| 7.25% Senior Notes Due 2018 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	44	44
Long-term Debt, Gross	$ 44	44
Interest rate, stated percentage	7.25%
Senior notes [Member] \| Floating Rate Senior Notes Due 2019 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 380	380
Long-term Debt, Gross	380	380
Senior notes [Member] \| 6.625% Senior Notes Due 2020 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	437	437
Long-term Debt, Gross	$ 437	437
Interest rate, stated percentage	6.625%
Senior notes [Member] \| 6.875% Senior Notes Due 2020 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 227	227
Long-term Debt, Gross	$ 227	227
Interest rate, stated percentage	6.875%
Senior notes [Member] \| 6.125% Senior Notes Due 2021 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 548	548
Long-term Debt, Gross	$ 548	548
Interest rate, stated percentage	6.125%
Senior notes [Member] \| 5.375% Senior Notes Due 2021 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 267	267
Long-term Debt, Gross	$ 267	267
Interest rate, stated percentage	5.375%
Senior notes [Member] \| 4.875% Senior Notes Due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 451	451
Long-term Debt, Gross	$ 451	451
Interest rate, stated percentage	4.875%
Senior notes [Member] \| 8.00% Senior Secured Second Lien Notes Due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,416	1,416
Long-term Debt, Gross	$ 1,870	1,895
Interest rate, stated percentage	8.00%
Senior notes [Member] \| 5.75% Senior Notes Due 2023 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 338	338
Long-term Debt, Gross	$ 338	338
Interest rate, stated percentage	5.75%
Senior notes [Member] \| 8.00% Senior Notes Due 2025 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,300	1,300
Long-term Debt, Gross	$ 1,290	1,290
Interest rate, stated percentage	8.00%
Senior notes [Member] \| 8.00% Senior Notes Due 2027 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,300	1,300
Long-term Debt, Gross	$ 1,298	1,298
Interest rate, stated percentage	8.00%
Convertible Debt [Member] \| 5.5% Convertible Senior Notes Due 2026 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,250	1,250
Long-term Debt, Gross	$ 844	837
Interest rate, stated percentage	5.50%
Interest rate, effective percentage	11.50%
Convertible Debt [Member] \| 2.25% Contingent Convertible Senior Notes Due 2038 [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 9	9
Long-term Debt, Gross	$ 8	8
Interest rate, stated percentage	2.25%
Interest rate, effective percentage	8.00%
Term Loan [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,233	1,233
Long-term Debt, Gross	1,233	1,233
Line of Credit [Member] \| Revolving credit facility [Member]
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	200	781
Revolving credit facility	$ 200	$ 781

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

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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.

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No definition available.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge.

+ References

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

The total amount of long-term liability charges that are being deferred beyond one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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

+ References

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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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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