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Organization and Basis of Presentation (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Noncontrolling Interest [Line Items]          
Incurred costs $ 1,450,000,000 $ 1,484,000,000 $ 4,142,000,000 $ 4,337,000,000  
Current Liabilities: Other 2,829,000,000   2,829,000,000   $ 2,367,000,000
ACP          
Noncontrolling Interest [Line Items]          
Current Liabilities: Other 935,000,000   935,000,000   0
Piedmont Natural Gas          
Noncontrolling Interest [Line Items]          
Incurred costs 75,000,000 $ 78,000,000 234,000,000 $ 241,000,000  
Current Liabilities: Other 59,000,000   59,000,000   67,000,000
Piedmont Natural Gas | Other          
Noncontrolling Interest [Line Items]          
Prepaid assets 23,000,000   23,000,000   $ 3,000,000
Incremental COVID-19 costs          
Noncontrolling Interest [Line Items]          
Incurred costs 39,000,000   91,000,000    
Deferred costs 56,000,000   56,000,000    
Waived late payment fees $ 29,000,000   $ 54,000,000