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Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation Allowances and Reserves, Balance | $ 134 us-gaap_ValuationAllowancesAndReservesBalance | $ 195 us-gaap_ValuationAllowancesAndReservesBalance | $ 175 us-gaap_ValuationAllowancesAndReservesBalance
Valuation Allowances and Reserves, Charged to Cost and Expense | 61 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 38 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 114 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Valuation Allowances and Reserves, Deductions | (88)us-gaap_ValuationAllowancesAndReservesDeductions | (77)us-gaap_ValuationAllowancesAndReservesDeductions | (79)us-gaap_ValuationAllowancesAndReservesDeductions
Valuation Allowances and Reserves, Adjustments | (11)us-gaap_ValuationAllowancesAndReservesAdjustments | (22)us-gaap_ValuationAllowancesAndReservesAdjustments | (15)us-gaap_ValuationAllowancesAndReservesAdjustments
Valuation Allowances and Reserves, Balance | $ 96 us-gaap_ValuationAllowancesAndReservesBalance | $ 134 us-gaap_ValuationAllowancesAndReservesBalance | $ 195 us-gaap_ValuationAllowancesAndReservesBalance

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- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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