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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

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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
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+ 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
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-Section 45
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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