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Condensed Statements of Income (Unaudited) - MPC - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating Revenues:        
Total operating revenues $ 7,823 $ 7,274 $ 22,572 $ 20,383
Operating Expenses:        
Other operations and maintenance 1,643 1,662 4,948 4,522
Depreciation and amortization 1,422 1,210 4,030 3,537
Taxes other than income taxes 288 375 1,136 1,155
Total operating expenses 5,229 4,906 16,204 14,373
Operating Income 2,594 2,368 6,368 6,010
Other Income and (Expense):        
Interest expense, net of amounts capitalized (755) (692) (2,343) (2,050)
Other income (expense), net 149 147 459 450
Total other income and (expense) (483) (456) (1,565) (1,326)
Earnings Before Income Taxes 2,111 1,912 4,803 4,684
Income taxes 404 377 973 890
Consolidated Net Income Attributable to Southern Company 1,711 1,535 3,925 3,867
Retail revenues        
Operating Revenues:        
Total operating revenues 5,707 5,366 15,065 13,793
Other revenues        
Operating Revenues:        
Total operating revenues 288 283 974 820
Operating Expenses:        
Fuel and purchased power 156 166 522 464
Mississippi Power        
Operating Revenues:        
Total operating revenues 480 412 1,301 1,118
Operating Expenses:        
Other operations and maintenance 94 90 261 261
Depreciation and amortization 53 48 157 141
Taxes other than income taxes 37 33 106 95
Total operating expenses 363 305 1,012 860
Operating Income 117 107 289 258
Other Income and (Expense):        
Interest expense, net of amounts capitalized (19) (19) (59) (58)
Other income (expense), net 10 9 26 33
Total other income and (expense) (9) (10) (33) (25)
Earnings Before Income Taxes 108 97 256 233
Income taxes 24 22 58 47
Consolidated Net Income Attributable to Southern Company 84 75 198 186
Mississippi Power | Retail revenues        
Operating Revenues:        
Total operating revenues 302 276 824 739
Mississippi Power | Wholesale revenues, non-affiliates        
Operating Revenues:        
Total operating revenues 72 66 205 179
Mississippi Power | Wholesale revenues, affiliates        
Operating Revenues:        
Total operating revenues 94 57 230 166
Mississippi Power | Other revenues        
Operating Revenues:        
Total operating revenues 12 13 42 34
Mississippi Power | Fuel and purchased power        
Operating Expenses:        
Fuel and purchased power $ 179 $ 134 $ 488 $ 363