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Revenue (Tables)
 3 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
State [Table Text Block]
Operating Revenues By State
Three Months Ended December 31
(in millions)
 
2018
 
2017
Alabama
$
392

 
$
361

Georgia
67

 
63

Kentucky
168

 
159

Mississippi
251

 
237

North Carolina
20

 
16

Tennessee
1,771

 
1,660

Virginia
12

 
12

Subtotal
2,681

 
2,508

Off-system sales
—

 
2

Revenue capitalized during pre-commercial plant operations(1)
—

 
(1
)
Revenue from sales of electricity
2,681

 
2,509

Other revenues
44

 
40

Total operating revenues
$
2,725

 
$
2,549