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Derivative Instruments and Hedging Activities - Narrative (Details) - Derivatives designated as hedging instruments - Cash flow hedges - Interest rate swaps - USD ($) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Dec. 31, 2012
Three Month London Interbank Offered Rate |  |
Interest Rate Swap Agreements |  |
Unrealized gain (loss) on interest rate cash flow hedges, AOCI | $ (9,000,000) |
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 losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + 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=64837297&loc=SL5624171-113959 + Details
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- Definition Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + 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 (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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