Consolidating Financial Information - Narrative (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Asset decrease	$ (17,064,000,000)	$ (16,511,000,000)	$ (16,391,000,000)
Liability decrease	(12,214,000,000)	(11,786,000,000)
Total shareholders' equity decrease	(4,850,000,000)	(4,725,000,000)
Net income increase	346,000,000	1,264,000,000	307,000,000
Reportable Legal Entities \| Parent Company
Debt Instrument [Line Items]
Asset decrease	(11,156,000,000)	(11,477,000,000)
Liability decrease	(6,553,000,000)	(6,970,000,000)
Total shareholders' equity decrease	(4,603,000,000)	(4,507,000,000)
Net income increase	346,000,000	1,264,000,000	307,000,000
Reportable Legal Entities \| Guarantor Subsidiaries
Debt Instrument [Line Items]
Asset decrease	(1,458,000,000)	(1,399,000,000)
Liability decrease	(402,000,000)	(268,000,000)
Total shareholders' equity decrease	(1,056,000,000)	(1,131,000,000)
Net income increase	45,000,000	125,000,000	43,000,000
Reportable Legal Entities \| Restatement Adjustment \| Parent Company
Debt Instrument [Line Items]
Asset decrease		113,000,000
Liability decrease		113,000,000
Reportable Legal Entities \| Restatement Adjustment \| Guarantor Subsidiaries
Debt Instrument [Line Items]
Asset decrease		358,000,000
Liability decrease		46,000,000
Total shareholders' equity decrease		312,000,000
Net income increase		$ 17,000,000	1,000,000
8.75% due 2020 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 282,000,000
Interest rate, stated percentage	8.75%
5.125% due 2023 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 1,000,000,000.0		$ 1,000,000,000
Interest rate, stated percentage	5.125%		5.125%
5% due 2026 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 900,000,000
Interest rate, stated percentage	5.00%
4.875% due 2027 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 700,000,000
Interest rate, stated percentage	4.875%

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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