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Guarantees and Indemnifications (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Jul. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Oct. 31, 2017
Guarantor Obligations [Line Items]          
Unused letters of credit $ 76        
Noncurrent Liabilities          
Guarantor Obligations [Line Items]          
Face value of guarantees 11     $ 23  
Off-balance sheet, credit loss, liability 4        
Letters of credit          
Guarantor Obligations [Line Items]          
Maximum potential amount of future payments associated with guarantees 566        
ACP          
Guarantor Obligations [Line Items]          
Maximum borrowing capacity   $ 1,900     $ 3,400
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP)          
Guarantor Obligations [Line Items]          
Off-balance sheet, credit loss, liability     $ 95    
Atlantic Coast Pipeline (ACP) | Current Liabilities | Atlantic Coast Pipeline (ACP)          
Guarantor Obligations [Line Items]          
Face value of guarantees 860        
Performance guarantee          
Guarantor Obligations [Line Items]          
Maximum potential of future amounts associated with guarantees with expiration dates 53        
Performance guarantee | Customers and other third parties          
Guarantor Obligations [Line Items]          
Maximum potential amount of future payments associated with guarantees 56        
Performance guarantee | Spectra Capital          
Guarantor Obligations [Line Items]          
Maximum potential amount of future payments associated with guarantees 56        
Financial guarantee | ACP          
Guarantor Obligations [Line Items]          
Maximum potential amount of future payments associated with guarantees $ 860        
Maximum exposure percentage 47.00%