Investments (Investments) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Investments [Abstract]
Time deposits	$ 3,184		$ 5,100
Pledged money market funds	56	[1]	57	[1]
Available-for-sale investments	8		15
Equity method investments	1,069		1,072
Restricted Cash	37	[2]
Other investments	34		25
Total	$ 4,388		$ 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.