Investments (Schedule Of Investments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Investments [Abstract]
Time deposits	$ 1,134		$ 5,100
Pledged money market funds	56	[1]	57	[1]
Available-for-sale investments	10		15
Equity method investments	1,003		1,072
Restricted Cash	31	[2]
Other investments	32		25
Total	$ 2,266		$ 6,269

[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] Restricted to pay group term life insurance premiums for certain employees on long-term disability.