Investments (Schedule Of Investments) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments [Abstract]
Equity method investments	[1]	$ 1,203		$ 1,214
Time deposits		108		613
Available-for-sale Securities, Debt Securities		478		490
Restricted Cash and Cash Equivalents	[2]	70	$ 74	74
Equity and other investments		45		48
Total		1,904		$ 2,439
Dividends received		$ 88	$ 96

[1] Dividends received were $88 and $96 for the three months ended March 31, 2018 and 2017.

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