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Investments and Restricted Cash, Cash Equivalents and Investments - EEGH - Components (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Investments:    
Equity method investments $ 6,443 $ 6,554
Total investments 7,236 8,490
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 883 916
Current assets 168 172
Noncurrent assets 14,394 15,788
Total investments and restricted cash, cash equivalents and investments 14,562 15,960
EEGH    
Investments:    
Total investments 423 412
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 18 17
Current assets 18 17
Noncurrent assets 423 412
Total investments and restricted cash, cash equivalents and investments 441 429
EEGH | Customer deposits    
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 18 17
Iroquois Gas Transmission System, L.P.    
Investments:    
Equity method investments 744 735
Iroquois Gas Transmission System, L.P. | EEGH    
Investments:    
Equity method investments 408 399
Investment funds | EEGH    
Investments:    
Investment funds $ 15 $ 13