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Investments Summary of Significant Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Revenues $ 11,700 $ 13,209 $ 14,144
Costs and Expenses 10,140 8,336 10,350
Net Income 180 2,239 1,919
Current assets 3,203 3,238  
Current liabilities 5,074 5,100  
Non-current liabilities 34,333 34,168  
Partners’/owners’ equity 31,436 33,742  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Schedule of Equity Method Investments [Line Items]      
Revenues 5,076 4,906 4,898
Costs and Expenses 4,249 3,508 3,245
Net Income 827 1,398 $ 1,653
Current assets 1,013 1,195  
Non-current assets 25,069 24,743  
Current liabilities 1,787 2,125  
Non-current liabilities 9,734 9,670  
Partners’/owners’ equity $ 14,561 $ 14,143