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Investments in Affiliates (Summarized Balance Sheet Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment In Affiliates [Abstract]        
Assets, Current $ 10,537 $ 6,317    
Other non-current assets, net 1,645 1,657    
Assets 105,963 95,144 $ 98,973  
Current Liabilities 10,835 5,923    
Equity 39,345 31,388 33,938 $ 31,017
Liabilities and Equity 105,963 95,144    
Assets, Current 10,537 6,317    
Other non-current assets, net 1,645 1,657    
Assets 105,963 95,144 98,973  
Current Liabilities 10,835 5,923    
Equity 39,345 31,388 $ 33,938 $ 31,017
Liabilities and Equity 105,963 95,144    
Equity Method Investments [Member]        
Investment In Affiliates [Abstract]        
Assets, Current 242 227    
Property, plant and equipment, net 7,239 7,339    
Other non-current assets, net 77 58    
Assets 7,558 7,624    
Current Liabilities 500 600    
Non-current liabilities 3,602 3,298    
Equity 3,456 3,726    
Liabilities and Equity 7,558 7,624    
Assets, Current 242 227    
Property, plant and equipment, net 7,239 7,339    
Other non-current assets, net 77 58    
Assets 7,558 7,624    
Current Liabilities 500 600    
Non-current liabilities 3,602 3,298    
Equity 3,456 3,726    
Liabilities and Equity $ 7,558 $ 7,624