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Operating Segments (Sales by Geographical Location of the Customer) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of geographical areas [Line Items]      
Sales $ 5,418 $ 5,363 $ 5,405
% of sales 100.00% 100.00% 100.00%
Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales $ 5,418 $ 5,363 $ 5,405
USA [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 1,091 $ 1,070 $ 1,176
% of sales 20.00% 20.00% 22.00%
China [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 724 $ 669 $ 550
% of sales 13.00% 12.00% 10.00%
Brazil [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 594 $ 521 $ 506
% of sales 11.00% 10.00% 9.00%
Germany [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 378 $ 392 $ 421
% of sales 7.00% 7.00% 8.00%
United Kingdom [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 328 $ 306 $ 303
% of sales 6.00% 6.00% 6.00%
Spain [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 264 $ 258 $ 285
% of sales 5.00% 5.00% 5.00%
Israel [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 171 $ 237 $ 240
% of sales 3.00% 4.00% 4.00%
France [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 265 $ 226 $ 295
% of sales 5.00% 4.00% 6.00%
India [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 200 $ 199 $ 206
% of sales 4.00% 4.00% 4.00%
Italy [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 121 $ 122 $ 117
% of sales 2.00% 2.00% 2.00%
All others [Member]      
Disclosure of geographical areas [Line Items]      
Sales $ 1,282 $ 1,363 $ 1,306
% of sales 24.00% 26.00% 24.00%