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Investments and Restricted Cash and Cash Equivalents and Investments - EEGH -Components (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Investments:    
Investments $ 5,513 $ 6,600
Equity method investments:    
Equity method investments 6,827 7,067
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 827 831
Investments, including equity method investments and restricted cash and investments, current 157 178
Investments, including equity method investments and restricted cash and investments, noncurrent 13,010 14,320
Investments, including equity method investments and restricted cash and investments 13,167 14,498
Eastern Energy Gas Holdings, LLC [Member]    
Investments:    
Investments 262 244
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 9 13
Investments, including equity method investments and restricted cash and investments, current 9 13
Investments, including equity method investments and restricted cash and investments, noncurrent 262 244
Investments, including equity method investments and restricted cash and investments 271 257
Eastern Energy Gas Holdings, LLC [Member] | Customer Deposits [Member]    
Restricted cash and cash equivalents:    
Restricted cash and cash equivalents 9 13
Iroquois Gas Transmission System L.P. [Member]    
Equity method investments:    
Equity method investments 586 580
Iroquois Gas Transmission System L.P. [Member] | Eastern Energy Gas Holdings, LLC [Member]    
Equity method investments:    
Equity method investments 250 244
Investment funds [Member] | Eastern Energy Gas Holdings, LLC [Member]    
Investments:    
Investment funds $ 12 $ 0