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Debt (Recourse Debt Carrying Amount and Terms) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Recourse Debt Total	$ 5,015	$ 5,258
Recourse Debt Current	0	(151)
Recourse Debt Non Current	5,015	$ 5,107
7.75% Senior Unsecured Note Due 2014 | Recourse Debt
Debt Instrument [Line Items]
Interest Rate		7.75%
7.75% Senior Unsecured Note Due 2015
Debt Instrument [Line Items]
Recourse Debt Total	$ 0	$ 151
7.75% Senior Unsecured Note Due 2015 | Recourse Debt
Debt Instrument [Line Items]
Interest Rate	7.75%	7.75%
9.75% Senior Unsecured Note Due 2016
Debt Instrument [Line Items]
Recourse Debt Total	$ 0	$ 164
9.75% Senior Unsecured Note Due 2016 | Recourse Debt
Debt Instrument [Line Items]
Interest Rate	9.75%	9.75%
8.00% Senior Unsecured Note Due 2017
Debt Instrument [Line Items]
Recourse Debt Total	$ 181	$ 525
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	$ 775
Senior Unsecured Note LIBOR plus 3% due 2019 | Recourse Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
8.00% Senior Unsecured Note Due 2020
Debt Instrument [Line Items]
Recourse Debt Total	$ 469	$ 625
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	$ 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	$ 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	$ 750
5.50% Senior Unsecured Note Due 2024 | Recourse Debt
Debt Instrument [Line Items]
Interest Rate	5.50%
5.50% Unsecured senior notes due 2025 [Domain] | Recourse Debt
Debt Instrument [Line Items]
Interest Rate	5.50%
Recourse Debt Total	$ 575	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
Debt Instrument [Line Items]
Recourse Debt Total		$ 1
Unamortized Premuim
Debt Instrument [Line Items]
Recourse Debt Total	$ (2)

X

- 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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X

- 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

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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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=6451184&loc=d3e28551-108399

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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