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

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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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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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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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	9 Months Ended
	Sep. 30, 2017 USD ($) day $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($) $ / €	Dec. 31, 2006 $ / €
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 9,775		$ 9,989
Long-term Debt, Gross	9,899		10,441
Deferred Long-term Liability Charges	(62)		(64)
Debt, Current	0		506
Current Maturities of Long-term Debt, Net	0		(503)
Long-term Debt, Fair Value	9,775		9,483
Long-term Debt, Net	9,899		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	618		990
Term Loan [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,500		1,500
Long-term Debt, Gross	1,500		1,500
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 \| $ / €			1.0517	1.3325
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
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
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	572		780
Long-term Debt, Gross	572		780
Senior Notes [Member] \| 6.875% Senior Notes Due 2020 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	279		279
Long-term Debt, Gross	278		278
Senior Notes [Member] \| 6.125% Senior Notes Due 2021 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	550		550
Long-term Debt, Gross	550		550
Senior Notes [Member] \| 5.375% Senior Notes Due 2021 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	270		270
Long-term Debt, Gross	270		270
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
Senior Notes [Member] \| 8.00% Senior Secured Second Lien Notes Due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,737		2,419
Long-term Debt, Gross	2,355		3,409
Debt Instrument, Unamortized Premium	260
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
Senior Notes [Member] \| 8.00% Senior Notes Due 2025 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,000		1,000
Long-term Debt, Gross	987		985
Senior Notes [Member] \| 8.00% Senior Notes Due 2027 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	750	$ 750	0
Long-term Debt, Gross	$ 750		0
Debt Instrument, Redemption Price, Percentage	108.00%
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	$ 831		811
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
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
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
Convertible Debt [Member] \| All Convertible and All Contingent Convertible Debt [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	(420)		(461)
Line of Credit [Member] \| Revolving Credit Facility [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	645		0
Long-term Line of Credit	$ 645		$ 0