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Derivative Instruments and Hedging Activities - Narrative (Details) - Derivatives designated as hedging instruments - Cash flow hedges - Interest rate swaps - USD ($) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2012
Three Month London Interbank Offered Rate |  |
Interest Rate Swap Agreements |  |
Unrealized gain (loss) on interest rate cash flow hedges, AOCI | $ (7,000,000) |
3 month LIBOR interest rate swap, cash flow hedge terminated March 2012 |  |
Interest Rate Swap Agreements |  |
Debt issued |  | $ 400,000,000
Loss on termination of swaps being amortized |  | 23,000,000
Other, net | 3 month LIBOR interest rate swap, cash flow hedge terminated March 2012 |  |
Interest Rate Swap Agreements |  |
Ineffective portion of the cash flow hedges |  | $ 2,000,000

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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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=84234895&loc=SL5624171-113959 + Details
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