Long-Term Debt (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt	$ 3,924
Capital leases	32	37
Other long-term debt	253	253
Total long-term debt	3,935	3,940
Less current portion	5	5
Long-term debt, net of current portion	3,930	3,935
2014
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	3.70%
Long-term debt	350	350
2015
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	1.85%
Long-term debt	500	500
2016
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	7.75%
Long-term debt	107	107
2018
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	6.75%
Long-term debt	200	200
2019
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	5.05%
Long-term debt	500	500
2021
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	3.50%
Long-term debt	700	700
2026
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	7.81%
Long-term debt	527	527
2031
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	7.75%
Long-term debt	466	466
2040
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt, Interest rate	5.05%
Long-term debt	$ 300	$ 300