Investments (Schedule Of Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Investments [Abstract]
Time deposits	$ 3,445			$ 3,135
Pledged money market funds	46	[1]		56	[1]
Available-for-sale investments	9			9
Equity method investments	1,135	[2]		1,137	[2]
Restricted cash	25	[3]		25	[3]
Other investments	35			35
Total	4,695			4,397
Proceeds from Equity Method Investment, Dividends or Distributions	$ 50		$ 53

[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] Dividends received were $50 and $53 during the three months ended March 31, 2013 and 2012.

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