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Debt (Recourse Debt Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 01, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 188 | $ 68 | $ 13 |
8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt terminated amount | $ 24 |  |  | 228 |  |  |
7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt terminated amount | $ 276 |  |  | 690 |  |  |
5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt terminated amount |  |  |  | 671 |  |  |
5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt terminated amount |  |  |  | 29 |  |  |
LIBOR 2.00% Senior Notes Due in 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 6 |  |  |  |
Senior Notes [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  | 500 |  |  |
Senior Notes [Member] | 5.125% Senior Notes Due 2017 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  | $ 500 | 500 |  |  |  |
Senior Notes [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt terminated amount |  |  | 217 |  |  |  |
Senior Notes [Member] | Senior Unsecured Note LIBOR plus 3% due 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt terminated amount |  |  | 240 |  |  |  |
Senior Notes [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 500 |  |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.50% |  |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.50% |  |  |
Senior Notes [Member] | LIBOR 2.00% Senior Notes Due in 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt terminated amount |  | 517 |  |  |  |  |
Debt face amount |  | $ 525 | $ 525 |  |  |  |
Recourse Debt |  |  |  |  |  |  |
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 |  |  |
Unsecured Debt [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.50% |  |  |
Unsecured Debt [Member] | 5.125% Senior Notes Due 2027 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.125%
Unsecured Debt [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 8.00% | 8.00% | 8.00% |  |  | 8.00%
Loss on extinguishment of debt |  |  | $ 47 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Note LIBOR plus 3% due 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 36 |  |  |  |
Unsecured Debt [Member] | 7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 7.375% |  |  | 7.375%
Unsecured Debt [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.00% |  |  |
Unsecured Debt [Member] | Recourse Debt | Senior Secured Term Loan due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  |  | $ 150 |  |  |
Loss on extinguishment of debt |  |  |  | 1 |  |  |
Unsecured Debt [Member] | Recourse Debt | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 125 |  |  |
Unsecured Debt [Member] | Recourse Debt | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 44 |  |  |
Parent Company [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 171 | $ 92 | $ 14 |

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