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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments in subsidiaries and investee companies [Line Items]        
Current assets $ 2,841 $ 2,684    
Non-current assets 6,823 6,489    
Current liabilities 2,177 1,761    
Non-current liabilities 3,399 3,351    
Equity 4,088 4,061 $ 3,915 $ 2,930
Sales 5,043 5,271 5,556  
Operating income (loss) 202 756 1,519  
Depreciation and amortization 579 433 420  
Net income (loss) 24 481 1,235  
Comprensive income 138 409 1,135  
Non-controlling interests [Member]        
Investments in subsidiaries and investee companies [Line Items]        
Current assets 149 151    
Non-current assets 400 346    
Current liabilities (189) (150)    
Non-current liabilities (76) (103)    
Equity (284) (244)    
Sales 359 349 387  
Operating income (loss) 29 23 0  
Depreciation and amortization 37 41 34  
Operating income before depreciation and amortization 66 64 34  
Net income (loss) 23 11 (13)  
Comprensive income $ 40 $ 8 $ 3