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Investments in Subsidiaries (Non-Controlling Interests in Subsidiaries - Balance Sheet) (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 (loss) 756 1,519 629  
Depreciation and amortization 433 420 418  
Net income (loss) 481 1,235 347  
Total comprehensive 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 (loss) 23 0 (21)  
Depreciation and amortization 41 34 34  
Operating income before depreciation and amortization 64 34 13  
Net income (loss) 11 (13) (38)  
Total comprehensive income (loss) $ 8 $ 3 $ (26)