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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, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 4,630 | $ 4,671
Less: Current maturities | (5) | 0
Recourse Debt Non Current | 4,625 | $ 4,671
Unamortized (discounts)/premiums & debt issuance (costs) |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ (40) |
Recourse Debt | Term Convertible Trust Securities 675 Due 2029 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 6.75% | 6.75%
Recourse Debt Total | $ 0 | $ 517
Recourse Debt | 8.00% Senior Unsecured Note Due 2017 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate |  | 8.00%
Recourse Debt | 8.00% Senior Unsecured Note Due 2020 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 8.00% | 8.00%
Recourse Debt | 7.38% Senior Unsecured Note Due 2021 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate |  | 7.38%
Recourse Debt | 5.50% Senior Unsecured Note Due 2024 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate |  | 5.50%
Recourse Debt | 5.50% Unsecured senior notes due 2025 [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate |  | 5.50%
Recourse Debt | 6.00% senior notes due 2026 [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate |  | 6.00%
Recourse Debt | LIBOR | Senior Secured Term Loan due 2022 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Basis spread on variable rate | 2.00% | 2.00%
Recourse Debt | LIBOR | Revolving Credit Facility [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Basis spread on variable rate | 2.00% | 2.00%
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 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 4,630 |
Junior subordinated notes and debentures payable | 0 | $ 517
Parent Company | Unamortized (discounts)/premiums & debt issuance (costs) |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | (40) | (45)
Parent Company | Recourse Debt | Senior Secured Term Loan due 2022 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 521 | 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 | $ 207 | $ 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% | 5.50%
Recourse Debt Total | $ 738 | $ 738
Parent Company | Recourse Debt | 5.50% Unsecured senior notes due 2025 [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 5.50% | 5.50%
Recourse Debt Total | $ 573 | $ 573
Parent Company | Recourse Debt | 6.00% senior notes due 2026 [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 6.00% | 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] |  |
Recourse Debt Total | $ 0 | $ 240
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 | $ 228 | $ 469
Parent Company | Recourse Debt Excluding Junior Subordinated Debt |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 4,630 | 4,154
Recourse Debt Non Current | 4,625 | $ 4,154
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 | 234 |
Debt Maturity Year Four [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 902 |
Debt Maturity Year Five [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | 500 |
Debt Maturity Thereafter [Member] | Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 3,024 |

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