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Investments and Restricted Cash, Cash Equivalents and Investments - EEGH - Components (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Investments:    
Equity method investments $ 6,330 $ 6,554
Total investments 9,760 8,490
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 878 916
Current assets 240 172
Noncurrent assets 16,728 15,788
Total investments and restricted cash, cash equivalents and investments 16,968 15,960
EEGH    
Investments:    
Total investments 419 412
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 25 17
Current assets 25 17
Noncurrent assets 419 412
Total investments and restricted cash, cash equivalents and investments 444 429
EEGH | Customer deposits    
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 25 17
Iroquois Gas Transmission System, L.P.    
Investments:    
Equity method investments 742 735
Iroquois Gas Transmission System, L.P. | EEGH    
Investments:    
Equity method investments 406 399
Investment funds | EEGH    
Investments:    
Investment funds $ 13 $ 13