Debt (Schedule Of Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Jul. 15, 2011	Sep. 30, 2012 Senior Debt Obligations Due 2012 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2012 [Member]	Sep. 30, 2012 Senior Debt Obligations Due 2013 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2013 [Member]	Sep. 30, 2012 Senior Debt Obligations Due 2033 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2033 [Member]	Sep. 30, 2012 Senior Debt Obligations Due 2014 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2014 [Member]	Jun. 27, 2011 Senior Debt Obligations Due 2014 [Member]	Sep. 30, 2012 Senior Debt Obligations Due 2015 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2015 [Member]	Jun. 27, 2011 Senior Debt Obligations Due 2015 [Member]	Sep. 30, 2012 Senior Debt Obligations Due 2017 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2017 [Member]	Sep. 30, 2012 Senior Debt Obligations Due 2019 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2019 [Member]	Sep. 30, 2012 Senior Debt Obligations Due 2021 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2021 [Member]	Sep. 30, 2012 Mortgage Due 2035 [Member]	Dec. 31, 2011 Mortgage Due 2035 [Member]	Sep. 30, 2012 Other [Member]	Dec. 31, 2011 Other [Member]
Long-term debt, current and noncurrent	$ 2,919	$ 2,928
Current portion of long-term debt	259	260	600
Long-term debt and capital lease obligations	$ 2,660	$ 2,668		$ 0	$ 250	$ 250	$ 251	$ 296	$ 296	$ 326	$ 326	$ 650	$ 479	$ 479	$ 750	$ 249	$ 0	$ 398	$ 398	$ 496	$ 496	$ 424	$ 431	$ 1	$ 1
Debt instrument, interest rate, stated percentage				6.25%		4.85%		5.875%		5.375%		5.375%	5.75%		5.75%	2.30%		9.25%		4.80%		5.70%
Debt instrument, interest rate, effective percentage				5.10%