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Investments in Subsidiaries and Investee Companies (Non-Controlling Interests in Subsidiaries) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments in subsidiaries and investee companies [Line Items]        
Current assets $ 2,725 $ 2,571    
Intangible assets 722 824    
Other non-current assets 373 292    
Current liabilities 2,328 2,023    
Long term liabilities 3,456 3,870    
Equity 2,930 2,659 $ 3,188 $ 3,000
Sales 5,418 5,363 5,405  
Operating income (loss) 629 (3) 765  
Depreciation and amortization 418 406 430  
Net loss 347 (172) 506  
Comprensive income (loss) 433 (291) $ 347  
Non-controlling interests [Member]        
Investments in subsidiaries and investee companies [Line Items]        
Current assets 197 227    
Intangible assets 69 64    
Other non-current assets 302 314    
Current liabilities 241 268    
Long term liabilities 215 197    
Equity 112 140    
Sales 363 377    
Operating income (loss) (21) (78)    
Depreciation and amortization 34 34    
Operating income (loss) before depreciation and amortization 13 (44)    
Net loss (38) (104)    
Comprensive income (loss) (52) (126)    
Equity accounted investees [Member]        
Investments in subsidiaries and investee companies [Line Items]        
Current assets 54 260    
Current liabilities 25 131    
Long term liabilities 26 406    
Sales $ 207 $ 315