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The price per share of the conversion feature embedded in the debt instrument.

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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

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

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt premium.

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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.

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

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Contractual rate at which a foreign currency can be purchased or sold.

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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.

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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.

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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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Debt - Long-Term Debt Table (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Oct. 13, 2017	Dec. 31, 2017 USD ($) day $ / shares	Dec. 31, 2016 USD ($)	Dec. 31, 2006 $ / €
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 9,981	$ 9,989
Long-term Debt, Gross		9,973	10,441
Deferred Long-term Liability Charges		(63)	(64)
Debt, Current		53	506
Current Maturities of Long-term Debt, Net		(52)	(503)
Long-term Debt, Fair Value		9,928	9,483
Long-term Debt, Net		9,921	9,938
Interest Rate Contract [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		0	0
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge		2	3
8.00% Senior Secured Second Lien Notes Due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium		479	990
5.5% Convertible Senior Notes Due 2026 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 1,250
Debt Instrument, Interest Rate, Stated Percentage			5.50%
Senior Notes [Member] \| 6.25% Euro-Denominated Senior Notes Due 2017 [ Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		0	$ 258
Long-term Debt, Gross		$ 0	$ 258
Senior Notes [Member] \| 6.25% Euro-Denominated Senior Notes Due 2017 [ Member] \| Cross Currency Interest Rate Contract [Member]
Long-Term Debt Instrument [Line Items]
Derivative, Forward Exchange Rate \| $ / €				1.3325
Debt Instrument, Interest Rate, Stated Percentage		6.25%	6.25%
Senior Notes [Member] \| 6.5% Senior Notes Due 2017 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 0	$ 134
Long-term Debt, Gross		$ 0	134
Debt Instrument, Interest Rate, Stated Percentage		6.50%
Senior Notes [Member] \| 7.25% Senior Notes Due 2018 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 44	64
Long-term Debt, Gross		$ 44	64
Debt Instrument, 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	780
Long-term Debt, Gross		$ 437	780
Debt Instrument, 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	279
Long-term Debt, Gross		$ 227	278
Debt Instrument, 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	550
Long-term Debt, Gross		$ 548	550
Debt Instrument, 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	270
Long-term Debt, Gross		$ 267	270
Debt Instrument, 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
Debt Instrument, 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	2,419
Long-term Debt, Gross		1,895	3,409
Debt Instrument, Unamortized Premium		$ 374
Debt Instrument, 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
Debt Instrument, 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	1,000
Long-term Debt, Gross		$ 1,290	985
Debt Instrument, Redemption Price, Percentage		98.52%
Debt Instrument, 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	0
Long-term Debt, Gross		$ 1,298	0
Debt Instrument, Redemption Price, Percentage	99.75%	108.00%
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		35.00%
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		$ 837	811
Debt Instrument, Interest Rate, Stated Percentage		5.50%
Debt Instrument, Interest Rate, Effective Percentage		11.50%
Convertible Debt [Member] \| 5.5% Convertible Senior Notes Due 2026 [Member] \| Optional Conversion by Holders [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Convertible, Terms of Conversion Feature \| day		5
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		130.00%
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 8.568
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		100.00%
Convertible Debt [Member] \| 5.5% Convertible Senior Notes Due 2026 [Member] \| Optional Redemption by the Company [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		130.00%
Debt Instrument, Date of First Required Payment		Sep. 15, 2019
Debt Instrument, Redemption Price, Percentage		100.00%
Convertible Debt [Member] \| 2.75% Contingent Convertible Senior Notes Due 2035 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 0	2
Long-term Debt, Gross		$ 0	2
Debt Instrument, Interest Rate, Stated Percentage		2.75%
Convertible Debt [Member] \| 2.5% Contingent Convertible Senior Notes Due 2037 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 0	114
Long-term Debt, Gross		$ 0	112
Debt Instrument, Interest Rate, Stated Percentage		2.50%
Convertible Debt [Member] \| 2.25% Contingent Convertible Senior Notes Due 2038 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 9	200
Long-term Debt, Gross		$ 8	180
Debt Instrument, Interest Rate, Stated Percentage		2.25%
Debt Instrument, Interest Rate, Effective Percentage		8.00%
Convertible Debt [Member] \| All Convertible and All Contingent Convertible Debt [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount		$ 414	461
Term Loan [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		1,233	1,500
Long-term Debt, Gross		$ 1,233	1,500
Debt Instrument, Term		5 years
Line of Credit [Member] \| Revolving Credit Facility [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 781	0
Long-term Line of Credit		$ 781	$ 0