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Operating Segments (Operating Income-Loss by Geographical Location of the Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [Line Items]      
Operating income $ 202 $ 756 $ 1,519
Israel [Member]      
Disclosure of geographical areas [Line Items]      
Operating income [1] 105 578 526
Europe [Member]      
Disclosure of geographical areas [Line Items]      
Operating income [2] (50) 32 834
Asia [Member]      
Disclosure of geographical areas [Line Items]      
Operating income 64 59 52
North America [Member]      
Disclosure of geographical areas [Line Items]      
Operating income 47 61 74
Others [Member]      
Disclosure of geographical areas [Line Items]      
Operating income 39 22 29
Intercompany eliminations [Member]      
Disclosure of geographical areas [Line Items]      
Operating income $ (3) $ 4 $ 4
[1] Israel operating income for 2020 includes a loss of $274 million resulting from impairments and the initiation of efficiency initiatives and measures. For further information, see Note 1B.
[2] Europe operating income for 2018 includes a gain of $841 million related to the divestiture of businesses.