Statements of Income - MPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues:
Total operating revenues	$ 23,113	$ 20,375	$ 21,419
Operating Expenses:
Other operations and maintenance	6,088	5,413	5,624
Depreciation and amortization	3,565	3,518	3,038
Taxes other than income taxes	1,290	1,234	1,230
Total operating expenses	19,415	15,490	13,683
Operating Income	3,698	4,885	7,736
Other Income and (Expense):
Interest expense, net of amounts capitalized	(1,837)	(1,821)	(1,736)
Other income (expense), net	456	336	252
Total other income and (expense)	(1,122)	(1,389)	(1,194)
Earnings Before Income Taxes	2,576	3,496	6,542
Income taxes (benefit)	267	393	1,798
Net Income (Loss)	2,309	3,103	4,744
Retail electric revenues
Operating Revenues:
Total operating revenues	14,852	13,643	14,084
Wholesale revenues
Operating Revenues:
Total operating revenues	2,455	1,945	2,152
Other revenues
Operating Revenues:
Total operating revenues	708	681	755
Operating Expenses:
Cost of sales	357	327	435
Fuel
Operating Expenses:
Cost of sales	4,010	2,967	3,622
Purchased power
Operating Expenses:
Cost of sales	978	799	816
Mississippi Power
Operating Revenues:
Total operating revenues	1,322	1,172	1,264
Operating Expenses:
Other operations and maintenance	313	284	307
Depreciation and amortization	180	183	192
Taxes other than income taxes	128	124	113
Total operating expenses	1,117	963	1,039
Operating Income	205	209	225
Other Income and (Expense):
Interest expense, net of amounts capitalized	(60)	(60)	(69)
Other income (expense), net	35	17	13
Total other income and (expense)	(25)	(43)	(56)
Earnings Before Income Taxes	180	166	169
Income taxes (benefit)	21	14	30
Net Income (Loss)	159	152	139
Mississippi Power | Retail electric revenues
Operating Revenues:
Total operating revenues	875	821	877
Mississippi Power | Wholesale revenues
Operating Revenues:
Total operating revenues	230	215	237
Mississippi Power | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	188	111	132
Mississippi Power | Other revenues
Operating Revenues:
Total operating revenues	29	25	18
Mississippi Power | Fuel
Operating Expenses:
Cost of sales	470	350	407
Mississippi Power | Purchased power
Operating Expenses:
Cost of sales	$ 26	$ 22	$ 20