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Investments and Restricted Cash and Investments - EEGH (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity method investments:      
Equity method investments $ 7,067 $ 3,947  
Restricted cash and cash equivalents:      
Restricted cash and investments 831 829  
Investments, including equity method and restricted cash and investments, current 178 240  
Investments, including equity method and restricted cash and investments, noncurrent 14,320 6,255  
Investments, including equity method and restricted cash and investments 14,498 6,495  
Distributions received from investments 77 74 $ 64
Eastern Energy Gas Holdings, LLC [Member]      
Equity method investments:      
Equity method investments 244 312  
Restricted cash and cash equivalents:      
Restricted cash and investments 13 12  
Investments, including equity method and restricted cash and investments, current 13 12  
Investments, including equity method and restricted cash and investments, noncurrent 244 312  
Investments, including equity method and restricted cash and investments 257 324  
Investment exceeded share of equity in net assets 130 146  
Eastern Energy Gas Holdings, LLC [Member] | Bank Time Deposits [Member]      
Restricted cash and cash equivalents:      
Restricted cash and investments 13 12  
Iroquois Gas Transmission System L.P. [Member]      
Equity method investments:      
Equity method investments $ 580 0  
Restricted cash and cash equivalents:      
Equity method investment, ownership percentage 50.00%    
Iroquois Gas Transmission System L.P. [Member] | Eastern Energy Gas Holdings, LLC [Member]      
Equity method investments:      
Equity method investments $ 244 276  
Restricted cash and cash equivalents:      
Equity method investment, ownership percentage 50.00%    
White River Hub, LLC [Member] | Eastern Energy Gas Holdings, LLC [Member]      
Equity method investments:      
Equity method investments $ 0 $ 36  
Restricted cash and cash equivalents:      
Equity method investment, ownership percentage 50.00%