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Investments and Restricted Cash and Cash Equivalents and Investments - EEGH - Components (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Investments:    
Equity method investments $ 6,724 $ 7,067
Total investments 7,791 6,600
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 960 831
Current assets 257 178
Noncurrent assets 15,218 14,320
Total investments and restricted cash and cash equivalents and investments 15,475 14,498
EEGH    
Investments:    
Total investments 259 244
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 17 13
Current assets 17 13
Noncurrent assets 259 244
Total investments and restricted cash and cash equivalents and investments 276 257
EEGH | Customer deposits    
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 17 13
Iroquois Gas Transmission System, L.P.    
Investments:    
Equity method investments 583 580
Iroquois Gas Transmission System, L.P. | EEGH    
Investments:    
Equity method investments 246 244
Investment funds | EEGH    
Investments:    
Investment funds $ 13 $ 0