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

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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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 additional borrowings, net of cash paid to third parties in connection with debt origination.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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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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Debt - Debt Issuances and Retirements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 17, 2018
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 8,168,000,000	$ 9,981,000,000
Cash paid to purchase debt	2,813,000,000	2,592,000,000	$ 2,734,000,000
Gains (losses) on debt restructuring	263,000,000	233,000,000	236,000,000
Deferred charges	53,000,000	63,000,000
Proceeds from issuance of senior notes, net	$ 1,236,000,000
8.00% senior secured second lien notes due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Premium		479,000,000
Senior notes [Member]
Long-Term Debt Instrument [Line Items]
Percentage of principal amount redeemed	100.00%
Redemption price percentage	35.00%
Senior notes [Member] \| 7.00% senior notes due 2024 and 7.50% senior notes due 2026 [Member]
Long-Term Debt Instrument [Line Items]
Proceeds from debt, net	$ 1,236,000,000
Senior notes [Member] \| 7.00% senior notes due 2024 [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 850,000,000	0
Interest rate, stated percentage	7.00%
Senior notes [Member] \| 7.50% senior notes due 2026 [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 400,000,000	0
Interest rate, stated percentage	7.50%
Senior notes [Member] \| 8.00% senior secured second lien notes due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 0	$ 1,416,000,000
Interest rate, stated percentage	8.00%	8.00%
Debt repurchased amount	$ 1,477,000,000
Premium		$ 374,000,000		$ 60,000,000
Gains (losses) on repurchases of debt		233,000,000		331,000,000
Gains (losses) on debt restructuring				$ 391,000,000
Senior notes [Member] \| 7.25% senior notes due 2018 [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 0	44,000,000
Interest rate, stated percentage	7.25%
Debt repurchased amount	$ 44,000,000
Senior notes [Member] \| 8.00% senior notes due 2027 [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 1,300,000,000	$ 1,300,000,000
Interest rate, stated percentage	8.00%	8.00%
Redemption price percentage		99.75%
Proceeds from issuance of debt		$ 1,285,000,000
Senior notes [Member] \| 8.00% new senior notes due 2025
Long-Term Debt Instrument [Line Items]
Debt, principal		$ 300,000,000
Redemption price percentage		101.25%
Proceeds from issuance of senior notes, net		$ 301,000,000
Senior notes [Member] \| 8.00% senior notes due 2025 [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 1,300,000,000	$ 1,300,000,000	$ 1,000,000,000.0
Interest rate, stated percentage	8.00%	8.00%
Redemption price percentage			98.52%
Convertible debt [Member] \| 2.25% contingent convertible senior notes due 2038 [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 1,000,000	$ 9,000,000
Interest rate, stated percentage	2.25%
Debt repurchased amount					$ 8,000,000
Term loan [Member]
Long-Term Debt Instrument [Line Items]
Debt, principal	$ 0	1,233,000,000
Debt repurchased amount	1,233,000,000
Cash paid to purchase debt	1,285,000,000
Premium	52,000,000
Gains (losses) on repurchases of debt	(65,000,000)
Deferred charges	$ 13,000,000
senior notes, senior secured second lien notes, contingent convertible notes and term [Member]
Long-Term Debt Instrument [Line Items]
Debt repurchased amount		2,389,000,000
Cash paid to purchase debt		$ 2,592,000,000
June 15, 2020 \| Senior notes [Member] \| 8.00% senior notes due 2027 [Member]
Long-Term Debt Instrument [Line Items]
Percentage of principal amount redeemed		35.00%
Redemption price percentage		108.00%