Investments (Schedule Of Investments) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Investments [Abstract]
Equity method investments	[1]	$ 1,149		$ 1,149		$ 1,214
Time deposits		1,343		1,343		613
Available for sale debt instruments		480		480		490
Restricted Cash and Cash Equivalents	[2]	128	$ 106	128	$ 106	74
Equity and other investments		46		46		48
Total		3,146		3,146		$ 2,439
Dividends received		$ 79	$ 47	$ 222	$ 195

[1] Dividends received were $222 and $79 for the nine and three months ended September 30, 2018 and $195 and $47 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.