Debt and Interest Costs - Debt refinancing (Details) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)
Debt Refinancing and Other Costs: (Abstract)
Economic hedge - interest rate risk	$ (16)
Debt refinancing and other costs	(61)
Senior Notes 3.5 Percent And 4.375 Percent
Debt Refinancing and Other Costs: (Abstract)
Interest expense on 3.5% and 4.375% senior notes	(25)
Bridge And Revolving Credit Facilities
Debt Refinancing and Other Costs: (Abstract)
Refinance of bridge and revolving credit facilities	(13)
Bridge Facility
Debt Refinancing and Other Costs: (Abstract)
Amortization of unsecured, committed bridge facility financing fees	$ (7)

Amount of interest related to callable debt related to a business acquisition.

No definition available.

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- Definition

no definition

+ References

No definition available.

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- Definition

Represents the amount of debt refinancing and other costs in hedging of interest rate risk.

+ References

No definition available.

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- Definition

Charges against earnings during the period related to debt refinancing and other debt-related costs other than interest expense on debt. Includes such items as amortization of financing fees, redemption and/or refinancing costs, interest rate risk on hedged instruments, and costs related to extinguishment of debt, etc.

+ References

No definition available.

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- Definition

Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

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