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Schedule I - Condensed Financial Information of Parent (Senior Notes and Junior Subordinated Notes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 3,655 | $ 4,630
Less: Current maturities | (5) | (5)
Recourse Debt Non Current | 3,650 | $ 4,625
Unamortized (discounts)/premiums & debt issuance (costs) |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ (31) |
Recourse Debt | LIBOR | Senior Secured Term Loan due 2022 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Basis spread on variable rate | 1.75% | 1.75%
Recourse Debt | LIBOR | Revolving Credit Facility [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Basis spread on variable rate | 2.00% | 2.00%
Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 3,655 |
Parent Company | Unamortized (discounts)/premiums & debt issuance (costs) |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | (31) | $ (40)
Parent Company | Recourse Debt | Senior Secured Term Loan due 2022 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 366 | 521
Parent Company | Recourse Debt | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 4.50% |
Recourse Debt Total | $ 500 | 0
Parent Company | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 4.88% |
Recourse Debt Total | $ 713 | 713
Parent Company | Recourse Debt | Revolving Credit Facility [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 0 | 207
Parent Company | Recourse Debt | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 4.00% |
Recourse Debt Total | $ 500 | 0
Parent Company | Recourse Debt | 8.00% Senior Unsecured Note Due 2017 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 8.00% |
Parent Company | Recourse Debt | 8.00% Senior Unsecured Note Due 2020 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 8.00% |
Parent Company | Recourse Debt | 7.38% Senior Unsecured Note Due 2021 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 7.38% |
Parent Company | Recourse Debt | 5.50% Senior Unsecured Note Due 2024 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 5.50% |
Recourse Debt Total | $ 63 | 738
Parent Company | Recourse Debt | 5.50% Unsecured senior notes due 2025 [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 5.50% |
Recourse Debt Total | $ 544 | 573
Parent Company | Recourse Debt | 6.00% senior notes due 2026 [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 6.00% |
Recourse Debt Total | $ 500 | $ 500
Parent Company | Recourse Debt | LIBOR | Senior Unsecured Note LIBOR plus 3% due 2019 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Basis spread on variable rate | 3.00% | 3.00%
Parent Company | Recourse Debt | LIBOR | 8.00% Senior Unsecured Note Due 2020 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 0 | $ 228
Parent Company | Recourse Debt Excluding Junior Subordinated Debt |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 3,655 | 4,630
Recourse Debt Non Current | 3,650 | $ 4,625
Debt Maturity Year One [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 5 |
Debt Maturity Year Two [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 5 |
Debt Maturity Year Three [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 505 |
Debt Maturity Year Four [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 350 |
Debt Maturity Year Five [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 1,213 |
Debt Maturity Thereafter [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 1,608 |

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