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Guarantees and Indemnifications (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Feb. 28, 2021
Dec. 31, 2020
Jul. 31, 2020
Oct. 31, 2017
Noncurrent Liabilities            
Guarantor Obligations [Line Items]            
Face value of guarantees $ 2 $ 2        
Letters of credit            
Guarantor Obligations [Line Items]            
Maximum potential amount of future payments associated with guarantees   411        
ACP            
Guarantor Obligations [Line Items]            
Maximum borrowing capacity         $ 1,900 $ 3,400
ACP | Atlantic Coast Pipeline (ACP)            
Guarantor Obligations [Line Items]            
Off-balance sheet, credit loss, liability       $ 95    
ACP | Atlantic Coast Pipeline (ACP) | Current Liabilities            
Guarantor Obligations [Line Items]            
Guarantor obligations settled     $ 855      
Performance guarantee | Customers and other third parties            
Guarantor Obligations [Line Items]            
Maximum potential amount of future payments associated with guarantees   26        
Performance guarantee | Spectra Capital            
Guarantor Obligations [Line Items]            
Maximum potential amount of future payments associated with guarantees   $ 33        
Financial guarantee | ACP            
Guarantor Obligations [Line Items]            
Maximum potential amount of future payments associated with guarantees       $ 860    
Maximum exposure (as a percent) 47.00%