Credit Facilities and Long-Term Debt (Details) - USD ($) $ in Millions		Sep. 30, 2015		Dec. 31, 2014		Sep. 20, 2011
Debt Instrument
Other Long-term Debt		$ 2		$ 5
Short-term borrowings and current maturities of long-term debt		79		89
Credit Facilities and Long-Term Debt :
Debt Issuance Cost		(4)		(4)
Unamortized discount	[1]	0		(1)
Long-term debt		1,196		1,195
Total debt		1,275		1,284
Senior Notes Due 2016, 3.550%
Credit Facilities and Long-Term Debt :
Senior Notes Due		600	[2]	600	[2]	$ 600
Senior Notes Due 2021, 4.875%
Credit Facilities and Long-Term Debt :
Senior Notes Due		600	[2]	600	[2]	$ 600
Risk Sharing Finance Facility Agreement [Member]
Credit Facilities and Long-Term Debt :
Line of Credit, Current		$ 77		$ 84

[1] he unamortized discount is recognized as a reduction in the carrying value of the Senior Notes in the Condensed Consolidated Balance Sheets and is being amortized to interest expense in our Condensed Consolidated Income Statements over the expected remaining terms of the Senior Notes.

[2] The fair value of our Senior Notes (as defined below) was determined using quoted prices in active markets for identical securities, which are considered Level 1 inputs. The fair value of our Senior Notes due 2016 was $613 million and $621 million as of September 30, 2015 and December 31, 2014, respectively. The fair value of our Senior Notes due 2021 was $655 million and $653 million as of September 30, 2015 and December 31, 2014, respectively.