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Condensed Statements of Income (Unaudited) - MPC - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Operating Revenues:    
Total operating revenues $ 8,397 $ 7,775
Operating Expenses:    
Other operations and maintenance 1,653 1,619
Depreciation and amortization 1,420 1,286
Taxes other than income taxes 464 445
Total operating expenses 6,379 5,765
Operating Income 2,018 2,010
Other Income and (Expense):    
Interest expense, net of amounts capitalized (778) (714)
Other income (expense), net 155 149
Total other income and (expense) (452) (460)
Earnings Before Income Taxes 1,566 1,550
Income taxes (benefit) 228 280
Consolidated Net Income Attributable to Southern Company 1,356 1,334
Retail revenues    
Operating Revenues:    
Total operating revenues 4,640 4,601
Other revenues    
Operating Revenues:    
Total operating revenues 336 349
Operating Expenses:    
Fuel and purchased power 181 199
Mississippi Power    
Operating Revenues:    
Total operating revenues 472 420
Operating Expenses:    
Other operations and maintenance 88 84
Depreciation and amortization 55 52
Taxes other than income taxes 36 33
Total operating expenses 384 335
Operating Income 88 85
Other Income and (Expense):    
Interest expense, net of amounts capitalized (20) (20)
Other income (expense), net 10 6
Total other income and (expense) (10) (14)
Earnings Before Income Taxes 78 71
Income taxes (benefit) 18 16
Consolidated Net Income Attributable to Southern Company 60 55
Mississippi Power | Retail revenues    
Operating Revenues:    
Total operating revenues 273 248
Mississippi Power | Wholesale revenues, non-affiliates    
Operating Revenues:    
Total operating revenues 87 71
Mississippi Power | Wholesale revenues, affiliates    
Operating Revenues:    
Total operating revenues 97 81
Mississippi Power | Other revenues    
Operating Revenues:    
Total operating revenues 15 20
Mississippi Power | Fuel and purchased power    
Operating Expenses:    
Fuel and purchased power $ 205 $ 166