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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, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	$ 3,396	$ 3,655
Less: Current maturities	(5)	(5)
Recourse Debt Non Current	3,391	$ 3,650
Unamortized (discounts)/premiums & debt issuance (costs)
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	$ (22)
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	1.75%	1.75%
Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	$ 3,396
Parent Company | Unamortized (discounts)/premiums & debt issuance (costs)
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	(22)	$ (31)
Parent Company | Recourse Debt | Senior Secured Term Loan due 2022 [Member]
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	$ 18	366
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	500
Parent Company | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member]
Condensed Financial Statements, Captions [Line Items]
Interest Rate	4.875%
Recourse Debt Total	$ 613	713
Parent Company | Recourse Debt | Revolving Credit Facility [Member]
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	$ 180	0
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	500
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	63
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	544
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 Excluding Junior Subordinated Debt
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	3,396	3,655
Recourse Debt Non Current	3,391	$ 3,650
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	505
Debt Maturity Year Three [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	8
Debt Maturity Year Four [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	1,113
Debt Maturity Year Five [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	243
Debt Maturity Thereafter [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	$ 1,544

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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X

- 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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- References

No definition available.

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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