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Debt (Recourse Debt Narrative) (Details) - USD ($) |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 25, 2014 | Jun. 16, 2014 | May. 20, 2014 | Mar. 07, 2014 | Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2014 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 25, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Interest Expense, Debt |  |  |  |  |  |  |  |  | $ (64,000,000) | $ (48,000,000) | $ (34,000,000) |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | $ 186,000,000 | $ 261,000,000 | $ 229,000,000 |
8% senior unsecured notes due 2017 and 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  | $ 82,000,000 |  |  |  |
Senior Notes [Member] | Five Point Five Zero Percent Senior Notes Due 2025 [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.50% |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 575,000,000 |  |  |  |  |  |  |
Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 6.75% |  |  |
Recourse Debt Covenants and Guarantees: |  |  |  |  |  |  |  |  |  |  |  |
Percentage of capital stock of foreign subsidiaries securing obligations |  |  |  |  |  |  |  |  | 65.00% |  |  |
Covenants, sale of guarantor or its subsidiaries percentage of proceeds used to repay debt |  |  |  |  |  |  |  |  | 60.00% |  |  |
Covenants, sale of guarantor or its subsidiaries percentage of proceeds used to repay debt if debt to cash flow is less than 5 |  |  |  |  |  |  |  |  | 50.00% |  |  |
Minimum ratio of operating cash flow to interest charges |  |  |  |  |  |  |  |  | 1.3 |  |  |
Maximum ratio of debt to cash flow |  |  |  |  |  |  |  |  | 7.5 |  |  |
Recourse Debt | Five Point Five Zero Percent Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.50% |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |
Recourse Debt | Three Percent Above Three Month LIBOR Floating Rate Notes Due June 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 775,000,000 |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |
Unsecured Debt [Member] | 8.0% Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  |  | $ 344,000,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 8.00% |  |  |  |  |  |  |
Unsecured Debt [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  |  | $ 156,000,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 8.00% |  |  |  |  |  |  |
Unsecured Debt [Member] | 7.75% Senior Notes Due 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  |  |  | $ 151,000,000 |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 7.75% |  |  |  |  |  |
Unsecured Debt [Member] | 9.75% Senior Notes Due 2016 [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  |  |  | $ 164,000,000 |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 9.75% |  |  |  |  |  |
Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Notice Call to Retire Notes |  |  |  |  |  |  |  |  |  |  |  | $ 320,000,000
Recourse Debt | 7.75% Senior Notes Due 2014 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  |  |  |  | $ 110,000,000 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 7.75% |  |  |  |  |
Recourse Debt | 8.0% Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 8.00% |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 132,000,000 |  |  |  |  |  |  |  |
Recourse Debt | Senior Secured Term Loan LIBOR Plus 2.75% Due 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt terminated amount |  | $ 29,000,000 | $ 767,000,000 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Recourse Debt | 7.75% Senior Unsecured Note Due 2015 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Notice Call to Retire Notes |  |  |  |  |  |  |  |  |  |  |  | 160,000,000
Recourse Debt | 9.75% Senior Unsecured Note Due 2016 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Notice Call to Retire Notes |  |  |  |  |  |  |  |  |  |  |  | $ 160,000,000

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