Investments (Schedule Of Investments) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Investments [Abstract]
Equity method investments	[1]	$ 1,159		$ 1,159		$ 1,214
Time deposits		1,084		1,084		613
Available for sale debt instruments		491		491		490
Restricted Cash and Cash Equivalents	[2]	74	$ 74	74	$ 74	74
Equity and other investments		44		44		48
Total		2,852		2,852		$ 2,439
Dividends received		$ 55	$ 52	$ 143	$ 148

[1] Dividends received were $143 and $55 for the six and three months ended June 30, 2018 and $148 and $52 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.