The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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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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Description of debt redemption features under terms of the debt agreement.

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Start date of debt instrument redemption period, in CCYY-MM-DD format.

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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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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount, after accumulated amortization, of debt premium.

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For a debtor, the aggregate gain (loss) recognized on the restructuring of payables arises from the difference between the book value of the debt before the restructuring and the fair value of the payments on the debt after restructuring is complete.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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Debt Debt - Debt Issuances and Retirements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 9,775		$ 9,775			$ 9,989
Cash Paid to Purchase Debt			1,751	$ 1,979
Gains (Losses) on Purchases or Exchanges of Debt	(1)	$ 87	183	255
8.00% Senior Secured Second Lien Notes Due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium	618		618			990
Senior Notes [Member] \| 8.00% Senior Notes Due 2027 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 750		$ 750		$ 750	0
Debt Instrument, Interest Rate, Stated Percentage	8.00%		8.00%		8.00%
Proceeds from Issuance of Senior Long-term Debt			$ 742
Debt Instrument, Redemption, Description			Some or all of the notes may be redeemed at any time prior to June 15, 2022, subject to a make-whole premium. We also may redeem some or all of the notes at any time on or after June 15, 2022, at the applicable redemption price in accordance with the terms of the notes and the indenture and supplemental indenture governing the notes
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed			35.00%
Debt Instrument, Redemption Period, Start Date			Jun. 15, 2020
Debt Instrument, Redemption Price, Percentage			108.00%
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		$ 1,737			$ 2,419
Debt Instrument, Interest Rate, Stated Percentage	8.00%		8.00%
Debt Instrument, Unamortized Premium	$ 260		$ 260
Senior Notes, Sr. Secured Notes, Contingent Convertible Notes [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 1,609		1,609
Cash Paid to Purchase Debt			$ 1,751
Senior Notes and Contingent Convertible Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		2,192		2,192
Cash Paid to Purchase Debt				1,500
Senior Notes and Contingent Convertible Senior Notes [Member] \| Privately Negotiated Exchanges for Common Stock [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 577		$ 577
Debt Conversion, Converted Instrument, Shares Issued				109,351,707