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Derivative Instruments and Hedging Activities (Details) - Derivatives designated as hedging instruments - Cash flow hedges - Interest Rate Swaps - 3 month LIBOR interest rate swap, cash flow hedge terminated March 2012 - USD ($) | 1 Months Ended | 12 Months Ended
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Mar. 31, 2012 | Dec. 31, 2012
Interest Rate Swap Agreements |  |
Debt issued |  | $ 400,000,000
Interest rate swap loss amortized as an increase to interest expense over the remaining term of the debt | $ 23,000,000 |
Other, net |  |
Interest Rate Swap Agreements |  |
Ineffective portion of the cash flow hedges |  | $ 2,000,000

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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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