Investments (Schedule Of Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011	Dec. 31, 2011
Investments [Abstract]
Time deposits	$ 4,505			$ 4,505			$ 1,134
Pledged money market funds	56	[1]		56	[1]		56	[1]
Available-for-sale investments	9			9			10
Equity method investments	1,153	[2]		1,153	[2]		1,003	[2]
Restricted cash	27	[3]		27	[3]		31	[3]
Other investments	35			35			32
Total	5,785			5,785			2,266
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	$ 155		$ 43	$ 276		$ 185

[1] (1) Reflects amounts pledged in lieu of letters of credit as collateral in support of our workers’ compensation programs. These funds can become available within 30 days notice upon issuance of replacement letters of credit.

[2] (2) Dividends received were $276 and $155 during the nine and three months ended September 30, 2012 and $185 and $43 during the nine and three months ended September 2011.

[3] (3) Restricted to pay group term life insurance premiums for certain employees and certain claims related to workers' compensation.