Investments (Schedule Of Investments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Investments [Abstract]
Equity method investments	[1]	$ 936		$ 1,031
Time deposits		17,154		50
Available for sale debt instruments		596		405
Equity and other investments		85		65
Restricted Cash and Cash Equivalents		83	[2]	86	[2]	$ 176
Total		18,854		1,637
Equity Method Investments and Joint Ventures [Abstract]
Dividends received from equity method investments		149		$ 164
Undistributed earnings from equity method investments		$ 148

[1] Dividends received were $149 and $164 during 2020 and 2019. Retained earnings at December 31, 2020 include undistributed earnings from our equity method investments of $148.

[2] Reflects amounts restricted in support of our workers’ compensation programs, employee benefit programs, and insurance premiums.Allowance for losses on available for sale debt instruments are assessed quarterly. All instruments are considered investment grade and, as such, we have not recognized an allowance for credit losses as of December 31, 2020.