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Debt (Details 1) (USD $) In Millions, unless otherwise specified			12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 4.90% Notes and Debentures due May 2014 [Member]	Sep. 20, 2011 4.90% Notes and Debentures due May 2014 [Member]	Dec. 31, 2010 6.125% Notes and Debentures due May 2019 [Member]	Sep. 20, 2011 6.125% Notes and Debentures due May 2019 [Member]	Dec. 31, 2010 7.40% Notes and Debentures due November 2025 [Member]	Dec. 31, 2010 Notes and Debentured due August 2048 [Member]	Dec. 31, 2010 4.70% Notes and Debentures December 2011 - 2014 [Member]	Dec. 31, 2010 Notes and Debentures Various 2011 - 2022 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:			May 2014		May 2019		November 2025	August 2048	December 2011 – 2014	Various 2010 – 2022
Interest Rate of Notes and debentures:		6.125%	4.90%	4.90%	6.125%	6.125%	7.40%		4.70%
Carrying Value of Notes and debentures:	$ 1,323		$ 500		$ 500		$ 250	$ 1	$ 66	$ 6
Fair Value of Notes and debentures:	$ 1,478		$ 538		$ 553		$ 311	$ 1	$ 69	$ 6

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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