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Investments in Affiliates (Summarized Balance Sheet Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment In Affiliates [Abstract]        
Assets, Current $ 6,317 $ 7,464    
Assets 95,144 98,973 $ 88,413  
Current Liabilities 5,923 7,724    
Equity 31,388 33,938 31,017 $ 30,092
Liabilities and Equity 95,144 98,973    
Assets, Current 6,317 7,464    
Assets 95,144 98,973 88,413  
Current Liabilities 5,923 7,724    
Equity 31,388 33,938 $ 31,017 $ 30,092
Liabilities and Equity 95,144 98,973    
Equity Method Investments [Member]        
Investment In Affiliates [Abstract]        
Assets, Current 227 247    
Property, plant and equipment, net 7,339 7,680    
Equity Method Investment, Summarized Financial Information, Noncurrent Assets 58 40    
Assets 7,624 7,967    
Current Liabilities 600 738    
Non-current liabilities 3,298 3,242    
Equity 3,726 3,987    
Liabilities and Equity 7,624 7,967    
Assets, Current 227 247    
Property, plant and equipment, net 7,339 7,680    
Equity Method Investment, Summarized Financial Information, Noncurrent Assets 58 40    
Assets 7,624 7,967    
Current Liabilities 600 738    
Non-current liabilities 3,298 3,242    
Equity 3,726 3,987    
Liabilities and Equity $ 7,624 $ 7,967