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Debt (Recourse Debt Carrying Amount and Terms) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Recourse Debt Total | $ 4,671 | $ 4,966
Recourse Debt Current | 0 | 0
Recourse Debt Non Current | $ 4,671 | 4,966
8.00% Senior Unsecured Note Due 2017 |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total |  | $ 181
8.00% Senior Unsecured Note Due 2017 | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 8.00% | 8.00%
Senior Unsecured Note LIBOR plus 3% due 2019 |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total |  | $ 775
Senior Unsecured Note LIBOR plus 3% due 2019 | Recourse Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.00% | 3.00%
8.00% Senior Unsecured Note Due 2020 |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total |  | $ 469
8.00% Senior Unsecured Note Due 2020 | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 8.00% | 8.00%
7.38% Senior Unsecured Note Due 2021 |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total |  | $ 1,000
7.38% Senior Unsecured Note Due 2021 | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.38% | 7.38%
4.88% Senior Unsecured Note Due 2023 |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total |  | $ 750
4.88% Senior Unsecured Note Due 2023 | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.88% | 4.88%
5.50% Senior Unsecured Note Due 2024 |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total |  | $ 750
5.50% Senior Unsecured Note Due 2024 | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.50% | 5.50%
5.50% Unsecured senior notes due 2025 [Domain] | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.50% | 5.50%
Recourse Debt Total |  | $ 575
6.00% senior notes due 2026 [Domain] | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.00% | 6.00%
Recourse Debt Total |  | $ 0
6.75% Term Convertible Trust Securities Due 2029 |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total | $ 517 | $ 517
6.75% Term Convertible Trust Securities Due 2029 | Recourse Debt |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.75% | 6.75%
Unamortized (discounts)/premiums & debt issuance (costs), net |  |
Debt Instrument [Line Items] |  |
Recourse Debt Total | $ (45) | $ (51)

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- Definition The current portion of the entity's recourse debt. Recourse debt is direct borrowings by the Parent Company that is structurally subordinate to the affiliates' non-recourse debt. + References No definition available. + Details
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- Definition The non-current portion of the entity's recourse debt. Recourse debt is direct borrowings by the Parent Company that is structurally subordinate to the affiliates' non-recourse debt. + References No definition available. + Details
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- Definition Recourse debt is direct borrowings by the Parent Company that is structurally subordinate to the affiliates non-recourse debt. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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