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Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Trade, allowance for doubtful accounts | $ 6 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 7 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, shares authorized | 50,000,000 us-gaap_PreferredStockSharesAuthorized | 50,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding |
Common stock, par value | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized | 450,000,000 us-gaap_CommonStockSharesAuthorized | 450,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding | 166,070,057 us-gaap_CommonStockSharesOutstanding | 145,338,342 us-gaap_CommonStockSharesOutstanding
Treasury stock, shares | 1,588,990 us-gaap_TreasuryStockShares | 18,742,288 us-gaap_TreasuryStockShares
Series A Preferred Stock [Member] |  |
Preferred Stock, par value | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred stock, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock [Member] |  |
Preferred Stock, par value | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 3,803,774 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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