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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, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 4,671 | $ 4,966
Less: Current maturities | 0 | 0
Recourse Debt Non Current | 4,671 | 4,966
8.00% Senior Unsecured Note Due 2017 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total |  | 181
Senior Unsecured Note LIBOR plus 3% due 2019 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total |  | 775
8.00% Senior Unsecured Note Due 2020 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total |  | 469
7.38% Senior Unsecured Note Due 2021 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total |  | 1,000
4.88% Senior Unsecured Note Due 2023 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total |  | 750
5.50% Senior Unsecured Note Due 2024 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total |  | 750
Unamortized (discounts)/premiums & debt issuance (costs), net |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ (45) | (51)
Recourse Debt |  |
Condensed Financial Statements, Captions [Line Items] |  |
Stated interest rate | 6.75% |
Junior subordinated notes and debentures payable | $ 517 | $ 517
Recourse Debt | 8.00% Senior Unsecured Note Due 2017 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 8.00% | 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% | 7.38%
Recourse Debt | 4.88% Senior Unsecured Note Due 2023 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 4.88% | 4.88%
Recourse Debt | 5.50% Senior Unsecured Note Due 2024 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 5.50% | 5.50%
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 |  | $ 575
Recourse Debt | 6.00% senior notes due 2026 [Domain] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 6.00% | 6.00%
Recourse Debt Total |  | $ 0
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 | $ 4,671 |
Junior subordinated notes and debentures payable | 517 | $ 517
Long-term Debt of Registrant, Maturities, Repayments of Principal, Fiscal Year Maturity [Abstract] |  |
2017 | 0 |
2018 | 0 |
2019 | 240 |
2020 | 469 |
2021 | 966 |
Thereafter | 3,041 |
Parent Company | Unamortized (discounts)/premiums & debt issuance (costs), net |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ (45) | $ (51)
Parent Company | Recourse Debt | 8.00% Senior Unsecured Note Due 2017 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 8.00% | 8.00%
Recourse Debt Total | $ 0 | $ 181
Parent Company | Recourse Debt | 8.00% Senior Unsecured Note Due 2020 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 8.00% | 8.00%
Recourse Debt Total | $ 469 | $ 469
Parent Company | Recourse Debt | 7.38% Senior Unsecured Note Due 2021 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 7.38% | 7.38%
Recourse Debt Total | $ 966 | $ 1,000
Parent Company | Recourse Debt | 4.88% Senior Unsecured Note Due 2023 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Interest Rate | 4.875% | 4.88%
Recourse Debt Total | $ 713 | $ 750
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 | $ 750
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 | $ 575
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 | $ 0
Parent Company | Recourse Debt | LIBOR | Senior Unsecured Note LIBOR plus 3% due 2019 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 240 | $ 775
Basis spread on variable rate | 3.00% | 3.00%
Parent Company | Recourse Debt Excluding Junior Subordinated Debt |  |
Condensed Financial Statements, Captions [Line Items] |  |
Recourse Debt Total | $ 4,154 | $ 4,449
Less: Current maturities | 0 | 0
Recourse Debt Non Current | $ 4,154 | $ 4,449

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