Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended					6 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Jun. 30, 2014 Letter of Credit [Member]	Jun. 30, 2014 Incremental Credit Facility [Member]	Jun. 30, 2014 Term Loan [Member]	Mar. 31, 2014 Term Loan [Member]	Dec. 31, 2013 Term Loan [Member]	Jun. 30, 2014 Swingline Loans [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Federal Funds Rate [Member]	Jun. 30, 2014 One Month L I B O R [Member]	Jun. 30, 2014 L I B O R [Member] Term Loan [Member]	Jun. 30, 2014 Foreign Subsidiaries [Member]	Jun. 30, 2014 Minimum [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Minimum [Member] Base Rate [Member] Term Loan [Member]	Jun. 30, 2014 Minimum [Member] Base Rate [Member] Base Rate Loans [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Minimum [Member] L I B O R [Member] Euro Dollar Rate [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Maximum [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Maximum [Member] Base Rate [Member] Base Rate Loans [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Maximum [Member] L I B O R [Member] Term Loan [Member]	Jun. 30, 2014 Maximum [Member] L I B O R [Member] Euro Dollar Rate [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Fiscal Year 2014 [Member]	Jun. 30, 2014 Fiscal Year 2015 [Member]	Jun. 30, 2014 Fiscal Year 2016 [Member]	Jun. 30, 2014 Fiscal Year 2017 [Member]	Jun. 30, 2014 Fiscal Year 2018 [Member]	Jun. 30, 2014 Fiscal Year 2019 [Member]	Jun. 30, 2014 Debt Offering Costs Deferred [Member] [Member] Domestic Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,000							$ 50
Line of Credit Facility, Additional Borrowing Capacity				100
Debt Instrument, Reduction of Basis Spread on Variable Rate																						0.00%
Payments of Financing Costs	10	1																												3
Repayments of Long-term Debt	556	2						95
Line of Credit Facility, Increase, Additional Borrowings	391	292					500
Leverage Ratio Maximum	2.75
Availability under Revolving Credit Facility [Abstract]
Line of Credit Facility, Expiration Date				Mar. 21, 2019	Mar. 28, 2017			Jan. 01, 2019
Line of Credit Facility, Amount Outstanding	479		403	280	110			199	200	294
Letters of Credit Outstanding, Amount				265
Line of Credit Facility, Remaining Borrowing Capacity				455
Line of Credit Facility, Increase, Additional Borrowings	391	292					500
Repayments of Lines of Credit	221	206
Credit Facilities Repayment Terms [Abstract]
Annual Remaining Amortization																								$ 1	$ 2	$ 2	$ 2	$ 2	$ 190
Additional Annual Payment Percentage Of Excess Cash Flow From Subsidiaries Subject To Term Loan Repayment	25.00%
Excess Cash Flow Percentage	0.00%
Leverage Ratio	3.00
Credit Facilities Interest and Fees [Abstract]
Debt Instrument, Basis Spread on Variable Rate												0.50%	1.00%				1.50%	1.25%	2.00%		1.75%	2.50%	2.75%
Percentage Of Fronting Fee						0.125%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																0.375%				0.50%
L I B O R Interest Rate Floor														0.75%
Guarantee Percent															65.00%
Debt Instrument Covenant Total Leverage Ratio Maximum	4.00
Debt Instrument Covenant Permitted Interest Ratio Minimum	3.00