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Investments and Restricted Cash and Cash Equivalents and Investments - EEGH - Components (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Investments:    
Equity method investments $ 6,759 $ 7,067
Total investments 7,498 6,600
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 897 831
Current assets 194 178
Noncurrent assets 14,960 14,320
Total investments and restricted cash and cash equivalents and investments 15,154 14,498
EEGH    
Investments:    
Total investments 260 244
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 11 13
Current assets 11 13
Noncurrent assets 260 244
Total investments and restricted cash and cash equivalents and investments 271 257
EEGH | Customer deposits    
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 11 13
Iroquois Gas Transmission System, L.P.    
Investments:    
Equity method investments 584 580
Iroquois Gas Transmission System, L.P. | EEGH    
Investments:    
Equity method investments 247 244
Investment funds | EEGH    
Investments:    
Investment funds $ 13 $ 0