Debt Credit Agreement (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Line of Credit Facility, Additional Borrowing Capacity	$ 1,000
Amended and Restated Credit Agreement \| Minimum
Line of Credit Facility [Line Items]
Contingent change in Appplicable Rate	0.00%
Amended and Restated Credit Agreement \| Maximum
Line of Credit Facility [Line Items]
Contingent change in Appplicable Rate	2.25%
Amended and Restated Credit Agreement \| JPMorgan Chase Bank, N.A.
Line of Credit Facility [Line Items]
Covenant Compliance, Maximum Ratio of Indebtedness to EBITDA	275.00%
Amended and Restated Credit Agreement \| Secured Debt
Line of Credit Facility [Line Items]
Letters of Credit Issued	$ 7
Tranche A Term Loan, Due 2018 \| Loans Payable
Line of Credit Facility [Line Items]
Borrowings	399	$ 399
Tranche A Term Loan, Due 2018 \| JPMorgan Chase Bank, N.A. \| Loans Payable
Line of Credit Facility [Line Items]
Borrowings	$ 400
Tranche A Term Loan, Due 2018 \| JPMorgan Chase Bank, N.A. \| Loans Payable \| LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%	1.00%
Rate effective	1.50%
Tranche A Term Loan, Due 2018 \| JPMorgan Chase Bank, N.A. \| Loans Payable \| Administrative Agents Alternate Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%	0.00%
Revolving Credit Facility \| Line of Credit
Line of Credit Facility [Line Items]
Borrowings	$ 0
Revolving Credit Facility \| Revolving Credit Facility \| JPMorgan Chase Bank, N.A.
Line of Credit Facility [Line Items]
Credit Agreement on Senior Secured Facilities	$ 1,500
Revolving Credit Facility \| Revolving Credit Facility \| JPMorgan Chase Bank, N.A. \| LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%	1.00%
Revolving Credit Facility \| Revolving Credit Facility \| JPMorgan Chase Bank, N.A. \| Administrative Agents Alternate Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%	0.00%

Debt Instrument, Contingent Interest Rate Variance

No definition available.

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- Definition

Debt Instrument, Covenant Compliance, Maximum Ratio of Indebtedness to EBITDA

+ References

No definition available.

+ Details

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- Definition

Amount of additional borrowing capacity under the credit facility, subject to approval of Administrative Agent and lenders.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Period Type:	instant

- Definition

Amount of borrowings from a bank classified as other, maturing within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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