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Investments and Restricted Cash and Cash Equivalents - EEGH (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity method investments:        
Equity method investments   $ 6,062 $ 6,554  
Restricted cash and cash equivalents:        
Restricted cash and investments   890 916  
Total investments and restricted cash and cash equivalents and investments   13,414 15,960  
Reflected as:        
Other current assets   2,141 172  
Noncurrent assets   11,273 15,788  
Equity income (loss)   (185) (237) $ (149)
EEGH        
Equity method investments:        
Equity method investments   278 412  
Restricted cash and cash equivalents:        
Restricted cash and investments   30 17  
Total investments and restricted cash and cash equivalents and investments   308 429  
Reflected as:        
Other current assets   30 17  
Noncurrent assets   278 412  
Investment exceeded share of equity in net assets   130 130  
Equity method investments contributions     154  
Distributions received from investments   195 44 77
Equity income (loss)   103 44 $ 42
EEGH | Investment funds        
Investments:        
Investment funds   14 13  
EEGH | Customer deposits        
Restricted cash and cash equivalents:        
Restricted cash and investments   30 17  
Iroquois Gas Transmission System, L.P.        
Equity method investments:        
Equity method investments   $ 600 735  
Reflected as:        
Equity method investment, ownership percentage   50.00%    
Iroquois Gas Transmission System, L.P. | EEGH        
Equity method investments:        
Equity method investments   $ 264 $ 399  
Reflected as:        
Equity method investment, ownership percentage   50.00%    
Equity income (loss) $ 45      
White River Hub, LLC | EEGH        
Reflected as:        
Equity method investment, ownership percentage   50.00%