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
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

Face (par) amount of debt instrument at time of issuance.

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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+ 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

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