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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2012
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Interest Rate Swap Agreements |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 1,000,000 | $ (3,000,000) | $ 0 | $ (3,000,000) |
Not Designated as Hedging Instrument [Member] | Currency Swap [Member] | Other, net |  |  |  |  |
Interest Rate Swap Agreements |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 1,000,000 | 0 | 1,000,000 | 0 |
Not Designated as Hedging Instrument [Member] | Interest rate swaps |  |  |  |  |
Interest Rate Swap Agreements |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (1,000,000) | (3,000,000) | (1,000,000) | (3,000,000) |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other, net |  |  |  |  |
Interest Rate Swap Agreements |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 1,000,000 | $ 0 | 0 | $ 0 |
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate swaps | Three Month London Interbank Offered Rate |  |  |  |  |
Interest Rate Swap Agreements |  |  |  |  |
Unrealized gain (loss) on interest rate cash flow hedges, AOCI |  |  | $ (7,000,000) |  |
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate swaps | 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
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate swaps | 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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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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=84234895&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=84228862&loc=SL7669646-108580 + Details
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