Investments (Schedule Of Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Investments [Abstract]
Time deposits	$ 5,560			$ 5,560			$ 3,135
Pledged money market funds	46	[1]		46	[1]		56	[1]
Available-for-sale investments	7			7			9
Equity method investments	1,126	[2]		1,126	[2]		1,137	[2]
Restricted cash	24	[3]		24	[3]		25	[3]
Other investments	34			34			35
Total	6,797			6,797			4,397
Proceeds from Equity Method Investment, Dividends or Distributions	$ 53		$ 68	$ 103		$ 121

[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 $103 and $53 during the six and three months ended June 30, 2013, and $121 and $68 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.