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Investments, Loans and LT Receivables - Financial Info (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 18, 2018
Equity Method Investment, Summarized Financial Information [Abstract]        
Total Revenues and Other Income $ 36,670 $ 38,727 $ 32,584  
Net income (loss) 7,257 6,305 (793)  
Total Current Assets 16,913 13,274    
Total Current Liabilities 7,043 7,395    
Equity method investments in affiliated companies, combined [Member]        
Equity Method Investment, Summarized Financial Information [Abstract]        
Total Revenues and Other Income 11,310 11,654 11,554  
Income (loss) before income taxes 3,726 3,660 (2,875)  
Net income (loss) 3,085 $ 3,244 $ (1,431)  
Total Current Assets 3,289     $ 3,285
Noncurrent assets 38,905     41,563
Total Current Liabilities 2,603     2,625
Noncurrent liabilities $ 22,168     $ 23,874