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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% |  |

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