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Consolidated Statements of Equity (USD $) In Millions, except Share data, unless otherwise specified | Total USD ($) | Common Stock Shares | Common Stock Amount USD ($) | Accumulated Other Comprehensive Loss USD ($) | Retained Earnings USD ($) | Noncontrolling Interests' Equity USD ($)
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 |  |  | $ 836 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | $ (6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 833 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance, shares at Dec. 31, 2011 |  | 75,362,956 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued pursuant to equity-based plans |  | 193,316 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Proceeds from issuance of shares pursuant to equity-based plans |  |  | 1 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Stock-based compensation |  |  | 4 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends declared |  |  | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (81)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net income (loss) | 140 us-gaap_ProfitLoss |  | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 141 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2012 |  |  | 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | (6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 893 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance, shares at Dec. 31, 2012 |  | 75,556,272 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuances of common stock, net of issuance costs of $3 |  | 2,365,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuances of common stock, net of issuance costs of $3 |  |  | 67 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued pursuant to equity-based plans |  | 164,287 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Proceeds from issuance of shares pursuant to equity-based plans |  |  | 1 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Stock-based compensation |  |  | 2 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends declared |  |  | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (85)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net income (loss) | 104 us-gaap_ProfitLoss |  | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 105 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income (loss) |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 1 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2013 | 1,820 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 911 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | (5)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 913 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance, shares at Dec. 31, 2013 |  | 78,085,559 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued pursuant to equity-based plans |  | 142,780 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Proceeds from issuance of shares pursuant to equity-based plans |  |  | 1 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Stock-based compensation |  |  | 6 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends declared |  |  | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (88)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net income (loss) | 174 us-gaap_ProfitLoss |  | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 175 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income (loss) |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | (2)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2014 | $ 1,911 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | $ 918 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | $ (7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance, shares at Dec. 31, 2014 |  | 78,228,339 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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