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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment in service, net $ 69,326 $ 69,573
Construction in Progress, Gross 4,499 3,732
Property, plant and equipment, net 73,825 73,305
Regulated Operation [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 89,733 89,292
Accumulated depreciation and amortization (26,921) (26,353)
Property, plant and equipment in service, net 62,812 62,939
Construction in Progress, Gross 4,400 3,600
Regulated Operation [Member] | Utility generation, transmission and distribution systems    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 81,518 81,127
Regulated Operation [Member] | Utility generation, transmission and distribution systems | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 5 years  
Regulated Operation [Member] | Utility generation, transmission and distribution systems | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 80 years  
Regulated Operation [Member] | Interstate natural gas pipeline assets    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 8,215 8,165
Regulated Operation [Member] | Interstate natural gas pipeline assets | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 3 years  
Regulated Operation [Member] | Interstate natural gas pipeline assets | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 80 years  
Unregulated Operation [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 8,850 8,817
Accumulated depreciation and amortization (2,336) (2,183)
Property, plant and equipment in service, net 6,514 6,634
Unregulated Operation [Member] | Independent power plants    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 7,004 6,983
Unregulated Operation [Member] | Independent power plants | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 5 years  
Unregulated Operation [Member] | Independent power plants | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 30 years  
Unregulated Operation [Member] | Other assets    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 1,846 $ 1,834
Unregulated Operation [Member] | Other assets | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 3 years  
Unregulated Operation [Member] | Other assets | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Life 30 years