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Investments in Subsidiaries and Investee Companies (Non-Controlling Interests in Subsidiaries - Profit and Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments in subsidiaries and investee companies [Line Items]        
Current assets $ 2,684 $ 2,788    
Non-current assets 6,489 5,988    
Current liabilities 1,761 2,009    
Non-current liabilities 3,351 2,852    
Equity 4,061 3,915 $ 2,930 $ 2,659
Sales 5,271 5,556 5,418  
Operating income 756 1,519 629  
Depreciation and amortization 433 420 418  
Net income (loss) 481 1,235 347  
Comprensive income (loss) 409 1,135 433  
Non-controlling interests [Member]        
Investments in subsidiaries and investee companies [Line Items]        
Current assets 151 192    
Non-current assets 346 318    
Current liabilities 150 225    
Non-current liabilities 103 49    
Equity 244 236    
Sales 349 387 363  
Operating income 23 0 (21)  
Depreciation and amortization 41 34 34  
Operating income before depreciation and amortization 64 34 13  
Net income (loss) 11 (13) (38)  
Comprensive income (loss) $ 8 $ 3 $ (26)