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Investments and Restricted Cash and Cash Equivalents and Investments - EEGH (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity method investments:      
Equity method investments $ 6,554 $ 7,067  
Restricted cash and cash equivalents:      
Restricted cash and investments 916 831  
Total investments and restricted cash and cash equivalents and investments 15,960 14,498  
Reflected as:      
Other current assets 172 178  
Noncurrent assets 15,788 14,320  
Equity method investments contributions 212 2,724 $ 1,617
EEGH      
Equity method investments:      
Equity method investments 412 244  
Restricted cash and cash equivalents:      
Restricted cash and investments 17 13  
Total investments and restricted cash and cash equivalents and investments 429 257  
Reflected as:      
Other current assets 17 13  
Noncurrent assets 412 244  
Investment exceeded share of equity in net assets 130    
Equity method investments contributions 154 2 4
Distributions received from investments 44 77 $ 74
EEGH | Investment funds      
Investments:      
Investment funds 13 0  
EEGH | Customer deposits      
Restricted cash and cash equivalents:      
Restricted cash and investments 17 13  
Iroquois Gas Transmission System, L.P.      
Equity method investments:      
Equity method investments $ 735 580  
Reflected as:      
Equity method investment, ownership percentage 50.00%    
Iroquois Gas Transmission System, L.P. | EEGH      
Equity method investments:      
Equity method investments $ 399 $ 244  
Reflected as:      
Equity method investment, ownership percentage 50.00%    
White River Hub, LLC | EEGH      
Reflected as:      
Equity method investment, ownership percentage 50.00%