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Debt Narrative - Holding Company Debt (Details) - Holding Company - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 06, 2017	Jan. 18, 2017
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ (12)
Additional borrowing availability	$ 346
6.750% senior unsecured notes due 2024
Debt Instrument [Line Items]
Debt face amount			$ 500
Interest rate on debt instrument			6.75%
6.250% senior unsecured notes due 2022
Debt Instrument [Line Items]
Debt face amount		$ 510	$ 695
Interest rate on debt instrument		6.25%	6.25%
6.375% senior unsecured notes due 2025
Debt Instrument [Line Items]
Debt face amount		$ 750
Interest rate on debt instrument		6.375%

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-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

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Contractual interest rate for funds borrowed, under the debt agreement.

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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

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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