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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Consolidating Financial Information - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Decrease in total assets	$ (17,852,000,000)		$ (17,852,000,000)			$ (16,511,000,000)
Decrease in total liabilities	(12,731,000,000)		(12,731,000,000)			(11,786,000,000)
Decrease in total shareholders' equity	(5,121,000,000)	$ (4,704,000,000)	(5,121,000,000)	$ (4,704,000,000)		(4,725,000,000)	$ (4,142,000,000)
Net income	129,000,000	317,000,000	442,000,000	703,000,000
Parent Company \| Reportable Legal Entities
Debt Instrument [Line Items]
Decrease in total assets	(11,771,000,000)		(11,771,000,000)			(11,477,000,000)
Decrease in total liabilities	(6,889,000,000)		(6,889,000,000)			(6,970,000,000)
Decrease in total shareholders' equity	(4,882,000,000)		(4,882,000,000)			(4,507,000,000)
Net income	129,000,000	317,000,000	442,000,000	703,000,000
Guarantor Subsidiaries \| Reportable Legal Entities
Debt Instrument [Line Items]
Decrease in total assets	(1,475,000,000)		(1,475,000,000)			(1,399,000,000)
Decrease in total liabilities	(297,000,000)		(297,000,000)			(268,000,000)
Decrease in total shareholders' equity	(1,178,000,000)		(1,178,000,000)			(1,131,000,000)
Net income	18,000,000	21,000,000	54,000,000	55,000,000
Restatement Adjustment \| Parent Company \| Reportable Legal Entities
Debt Instrument [Line Items]
Decrease in total assets						113,000,000
Decrease in total liabilities						113,000,000
Restatement Adjustment \| Guarantor Subsidiaries \| Reportable Legal Entities
Debt Instrument [Line Items]
Decrease in total assets						358,000,000
Decrease in total liabilities						46,000,000
Decrease in total shareholders' equity						$ 312,000,000
Net income		$ 4,000,000		$ 12,000,000
8.75% due 2020 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 282,000,000		$ 282,000,000
Interest rate, stated percentage	8.75%		8.75%
5.125% due 2023 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,000,000,000		$ 1,000,000,000
Interest rate, stated percentage	5.125%		5.125%
5% due 2026 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 900,000,000		$ 900,000,000
Interest rate, stated percentage	5.00%		5.00%
4.875% due 2027 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 700,000,000		$ 700,000,000		$ 700,000,000
Interest rate, stated percentage	4.875%		4.875%		4.875%