Consolidated Statement of Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common Stock, shares	137,603,643us-gaap_CommonStockSharesIssued	136,682,631us-gaap_CommonStockSharesIssued	136,500,000us-gaap_CommonStockSharesIssued
Common Stock Value	$ 1us-gaap_CommonStockValue	$ 1us-gaap_CommonStockValue	$ 1us-gaap_CommonStockValue
Treasury Stock, Shares	(275,069)us-gaap_TreasuryStockShares	(460,914)us-gaap_TreasuryStockShares	(1,200,000)us-gaap_TreasuryStockShares
Treasury Stock	(10)us-gaap_TreasuryStockValue	(13)us-gaap_TreasuryStockValue	(36)us-gaap_TreasuryStockValue
Additional Paid in Capital	1,576us-gaap_AdditionalPaidInCapital	1,539us-gaap_AdditionalPaidInCapital	1,522us-gaap_AdditionalPaidInCapital
Retained Earnings (Accumulated Deficit)	2,327	1,427	1,300
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1)	2	(7)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,893	2,956	2,780
Issuances of common stock, value	6	1	2
Stock-based compensation	45	45	46
Stock Issued During Period, Value, Treasury Stock Reissued	(11)	(6)	(7)
Net income (loss)	900us-gaap_NetIncomeLoss	147us-gaap_NetIncomeLoss	(1,184)us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Tax	(3)	9	3
Payments for Repurchase of Preferred Stock and Preference Stock	0	(20)	0
Common Stock
Issuances of common stock, shares	900,000	200,000	100,000
Issuances of common stock, value	0	0	0
Treasury Stock
Stock Issued During Period, Shares, Treasury Stock Reissued	200,000	700,000	500,000
Stock Issued During Period, Value, Treasury Stock Reissued	3	23	14
Additional Paid-in Capital
Issuances of common stock, value	6	1	2
Stock-based compensation	45	45	46
Stock Issued During Period, Value, Treasury Stock Reissued	(14)	(29)	(21)
Retained Earnings
Net income (loss)	900	147	(1,184)
Payments for Repurchase of Preferred Stock and Preference Stock		(20)
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Net of Tax	$ (3)	$ 9	$ 3

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3