Investments (Schedule Of Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Investments [Abstract]
Time deposits	$ 5,790			$ 5,790			$ 3,135
Pledged money market funds	46	[1]		46	[1]		56	[1]
Available-for-sale investments	8			8			9
Equity method investments	1,127	[2]		1,127	[2]		1,137	[2]
Restricted cash	33	[3]		33	[3]		25	[3]
Other investments	34			34			35
Total	7,038			7,038			4,397
Proceeds from Equity Method Investment, Dividends or Distributions	$ 60		$ 155	$ 163		$ 276

[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 $163 and $60 during the nine and three months ended September 30, 2013, and $276 and $155 during the same periods in the prior year.

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