Investments (Schedule Of Investments) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investments [Abstract]
Equity method investments	[1]	$ 1,226		$ 1,226		$ 1,242
Time deposits		858		858		665
Available-for-sale investments		513		513		537
Restricted Cash and Cash Equivalents	[2]	106		106		68
Other investments		30		30		33
Total		2,733		2,733		$ 2,545
Dividends received		$ 47	$ 83	$ 195	$ 249

[1] Dividends received were $195 and $47 for the nine and three months ended September 30, 2017 and $249 and $83 during the same periods in the prior year.

[2] Reflects amounts restricted in support of our workers’ compensation programs, employee benefit programs, and insurance premiums.