Debt and Capital Lease Obligations (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended					12 Months Ended				12 Months Ended				12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Debenture Due In 2026 [Member]	Dec. 31, 2010 Debenture Due In 2026 [Member]	Dec. 31, 2011 Debenture Due In 2015 [Member]	Dec. 31, 2010 Debenture Due In 2015 [Member]	Dec. 31, 2011 Senior Notes Due In May 2011 [Member]	Dec. 31, 2010 Senior Notes Due In May 2011 [Member]	Dec. 31, 2011 Senior Notes Due In 2013 [Member]	Dec. 31, 2010 Senior Notes Due In 2013 [Member]	Dec. 31, 2011 Senior Notes Due In February 2011 [Member]	Dec. 31, 2010 Senior Notes Due In February 2011 [Member]	Dec. 31, 2011 Senior Notes Due In 2037 [Member]	Dec. 31, 2010 Senior Notes Due In 2037 [Member]	Dec. 31, 2011 Senior Notes Due In 2017 [Member]	Dec. 31, 2010 Senior Notes Due In 2017 [Member]	Dec. 31, 2011 Senior Notes Due In 2097 [Member]	Dec. 31, 2010 Senior Notes Due In 2097 [Member]	Dec. 31, 2011 Senior Notes Due In March 2019 [Member]	Dec. 31, 2010 Senior Notes Due In March 2019 [Member]	Dec. 31, 2011 Senior Notes Due In March 2039 [Member]	Dec. 31, 2010 Senior Notes Due In March 2039 [Member]	Dec. 31, 2011 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member]	Dec. 31, 2010 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member]	Dec. 31, 2011 Other Debt [Member]	Dec. 31, 2010 Other Debt [Member]	Dec. 31, 2011 Bank Credit Facilities [Member]	Dec. 31, 2011 Tax Exempt Revenue Refunding Bonds Series 1997A [Member]	Apr. 30, 2011 Tax Exempt Revenue Refunding Bonds Series 1997A [Member]	Dec. 31, 2010 Tax Exempt Revenue Refunding Bonds Series 1997A [Member]	Apr. 30, 2010 Tax Exempt Revenue Refunding Bonds Series 1997A [Member]	Dec. 31, 2011 Tax Exempt Revenue Refunding Bonds Series 1997B [Member]	Apr. 30, 2011 Tax Exempt Revenue Refunding Bonds Series 1997B [Member]	Dec. 31, 2010 Tax Exempt Revenue Refunding Bonds Series 1997B [Member]	Apr. 30, 2010 Tax Exempt Revenue Refunding Bonds Series 1997B [Member]	Dec. 31, 2011 Tax Exempt Revenue Refunding Bonds Series 1997C [Member]	Apr. 30, 2011 Tax Exempt Revenue Refunding Bonds Series 1997C [Member]	Dec. 31, 2010 Tax Exempt Revenue Refunding Bonds Series 1997C [Member]	Apr. 30, 2010 Tax Exempt Revenue Refunding Bonds Series 1997C [Member]	Dec. 31, 2011 Tax Exempt Waste Disposal Revenue Bonds Series 1997 [Member]	Dec. 31, 2010 Tax Exempt Waste Disposal Revenue Bonds Series 1997 [Member]	Dec. 31, 2011 Tax Exempt Waste Disposal Revenue Bonds Series 1998 [Member]	Dec. 31, 2010 Tax Exempt Waste Disposal Revenue Bonds Series 1998 [Member]	Dec. 31, 2011 Tax Exempt Waste Disposal Revenue Bonds Series 1999 [Member]	Dec. 31, 2010 Tax Exempt Waste Disposal Revenue Bonds Series 1999 [Member]	Dec. 31, 2011 Tax Exempt Waste Disposal Revenue Bonds Series 2001 [Member]	Dec. 31, 2010 Tax Exempt Waste Disposal Revenue Bonds Series 2001 [Member]	Dec. 31, 2011 Notes Due In February 2015 [Member]	Dec. 31, 2010 Notes Due In February 2015 [Member]	Feb. 28, 2010 Notes Due In February 2015 [Member]	Dec. 31, 2011 Notes Due In 2013 [Member]	Dec. 31, 2010 Notes Due In 2013 [Member]	Dec. 31, 2011 Notes Due In 2014 [Member]	Dec. 31, 2010 Notes Due In 2014 [Member]	Dec. 31, 2011 Notes Due In 2017 [Member]	Dec. 31, 2010 Notes Due In 2017 [Member]	Dec. 31, 2011 Notes Due In February 2020 [Member]	Dec. 31, 2010 Notes Due In February 2020 [Member]	Feb. 28, 2010 Notes Due In February 2020 [Member]	Dec. 31, 2011 Notes Due In 2037 [Member]	Dec. 31, 2010 Notes Due In 2037 [Member]	Dec. 31, 2011 Notes Due In 2012 [Member]	Dec. 31, 2010 Notes Due In 2012 [Member]	Dec. 31, 2011 Notes Due In 2032 [Member]	Dec. 31, 2010 Notes Due In 2032 [Member]	Dec. 31, 2011 Notes Due In 2030 [Member]	Dec. 31, 2010 Notes Due In 2030 [Member]	May 31, 2011 Senior Notes Due In May 2011 [Member]	Feb. 28, 2011 Senior Notes Due In February 2011 [Member]	Dec. 31, 2009 Senior Notes Due In 2037 [Member]	Mar. 31, 2009 Senior Notes Due In March 2019 [Member]	Mar. 31, 2009 Senior Notes Due In March 2039 [Member]	Mar. 31, 2010 Senior Notes Due In June 2015 [Member]
Debt Instruments
Debt instruments maturity date (year)			2026		2015		2011		2013		2011		2037		2017		2097		2019		2039		2040		2012		Various	2027				2018				2018				2031		2032		2032		2032		2015			2013		2014		2017		2020			2037		2012		2032		2030
Bank credit facilities	$ 0	$ 0
Industrial revenue bond																												18		21		0		30		0		30		25	25	25	25	25	25	19	19
Other notes payable																																																400	400		300	300	200	200	750	750	850	850		1,500	1,500	750	750	750	750	200	200
Debentures			100	100	75	75
Senior notes							0	200	180	180	0	210	24	24	200	200	100	100	750	750	250	250
Revenue bond																							0	300
Accounts receivable sales facility																									250	100
Net unamortized discount, including fair value adjustments	(51)	(64)
Total debt	7,690	8,300
Capital lease obligations, including unamortized fair value adjustments	51	37
Total debt and capital lease obligations	7,741	8,337
Less current portion	(1,009)	(822)
Debt and capital lease obligations, less current portion	$ 6,732	$ 7,515
Interest rate of notes in percentage			7.65%		8.75%		6.125%		6.70%		6.75%		6.75%		7.20%		7.45%		9.375%		10.50%							5.45%	5.45%		5.45%	5.40%	5.40%		5.40%	5.40%	5.40%		5.40%	5.60%		5.60%		5.70%		6.65%		4.50%		4.50%	4.75%		4.75%		6.125%		6.125%		6.125%	6.625%		6.875%		7.50%		8.75%		6.125%	6.75%	6.75%	9.375%	10.50%	7.50%