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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments in subsidiaries and investee companies [Line Items]        
Current assets $ 2,788 $ 2,725    
Non-current assets 5,988 5,989    
Current liabilities 2,009 2,328    
Non-current liabilities 2,852 3,456    
Equity 3,915 2,930 $ 2,659 $ 3,188
Sales 5,556 5,418 5,363  
Operating income (loss) 1,519 629 (3)  
Depreciation and amortization 420 418 406  
Net income (loss) 1,235 347 (172)  
Comprensive income (loss) 1,135 433 (291)  
Non-controlling interests [Member]        
Investments in subsidiaries and investee companies [Line Items]        
Current assets 192 197    
Non-current assets 318 367    
Current liabilities 225 241    
Non-current liabilities 49 215    
Equity 236 108    
Sales 387 363 377  
Operating income (loss) 0 (21) (78)  
Depreciation and amortization 34 34 34  
Operating income (loss) before depreciation and amortization 34 13 (44)  
Net income (loss) (13) (38) (104)  
Comprensive income (loss) $ 3 $ (26) $ (126)