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Segment and Related Information
 3 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
Segment and Related Information SEGMENT AND RELATED INFORMATION
Southern Company
The primary businesses of the Southern Company system are electricity sales by the traditional electric operating companies and Southern Power and the distribution of natural gas by Southern Company Gas. The traditional electric operating companies are vertically integrated utilities providing electric service in three Southeastern states. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy and battery energy storage projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through its natural gas distribution utilities and is involved in several other complementary businesses including gas pipeline investments and gas marketing services. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' other businesses also included wholesale gas services.
Southern Company's reportable business segments are the sale of electricity by the traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. Revenues from sales by Southern Power to the traditional electric operating companies were $105 million and $81 million for the three months ended March 31, 2022 and 2021, respectively. Revenues from sales of natural gas from Southern Company Gas to the traditional electric operating companies were immaterial for both periods presented. Revenues from sales of natural gas from Southern Company Gas to Southern Power were $12 million for the three months ended March 31, 2021, which represented sales from Sequent prior to its sale. The "All Other" column includes the Southern Company parent entity, which does not allocate operating expenses to business segments. Also, this category includes segments below the quantitative threshold for separate disclosure. These segments include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications and, for the three months ended March 31, 2021, leveraged lease projects. All other inter-segment revenues are not material.
Financial data for business segments and products and services for the three months ended March 31, 2022 and 2021 was as follows:
Electric Utilities
Traditional
Electric Operating
Companies		Southern
Power		EliminationsTotalSouthern Company GasAll
Other		EliminationsConsolidated
(in millions)
Three Months Ended March 31, 2022
Operating revenues$4,191 $539 $(221)$4,509 $2,058 $123 $(42)$6,648 
Segment net income (loss)(a)
774 72 — 846 319 (125)(8)1,032 
At March 31, 2022
Goodwill$— $2 $— $2 $5,015 $263 $— $5,280 
Total assets90,460 13,766 (627)103,599 23,377 4,236 (2,573)128,639 
Three Months Ended March 31, 2021
Operating revenues$3,764 $440 $(87)$4,117 $1,694 $134 $(35)$5,910 
Segment net income (loss)(a)(b)(c)
756 97 — 853 398 (108)(8)1,135 
At December 31, 2021
Goodwill$— $2 $— $2 $5,015 $263 $— $5,280 
Total assets89,051 13,390 (667)101,774 23,560 2,975 (775)127,534 
(a)Attributable to Southern Company.
(b)For the traditional electric operating companies, includes a pre-tax charge of $48 million ($36 million after tax) at Georgia Power for estimated losses associated with the construction of Plant Vogtle Units 3 and 4. See Note (B) and Note 2 to the financial statements in Item 8 of the Form 10-K under "Georgia Power – Nuclear Construction" for additional information.
(c)For Southern Power, includes gains on wind turbine equipment contributed to various equity method investments totaling approximately $37 million pre-tax ($28 million after tax). See Note 15 to the financial statements under "Southern Power – Development Projects" in Item 8 of the Form 10-K for additional information.
Products and Services
 Electric Utilities' Revenues
RetailWholesaleOtherTotal
(in millions)
Three Months Ended March 31, 2022$3,613 $664 $232 $4,509 
Three Months Ended March 31, 20213,342 545 230 4,117 
 Southern Company Gas' Revenues
Gas
Distribution
Operations
Wholesale
Gas
Services(*)
Gas
Marketing
Services		OtherTotal
(in millions)
Three Months Ended March 31, 2022$1,791 $— $243 $24 $2,058 
Three Months Ended March 31, 20211,192 298 195 9 1,694 
(*)Prior to the sale of Sequent, the revenues for wholesale gas services were netted with costs associated with its energy and risk management activities. See "Southern Company Gas" herein and Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.
Southern Company Gas
Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' reportable segments also included wholesale gas services. The non-reportable segments are combined and presented as all other. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information on the sale of Sequent.
Gas distribution operations is the largest component of Southern Company Gas' business and includes natural gas local distribution utilities that construct, manage, and maintain intrastate natural gas pipelines and gas distribution facilities in four states.
Gas pipeline investments consists of joint ventures in natural gas pipeline investments including a 50% interest in SNG and a 50% joint ownership interest in the Dalton Pipeline. These natural gas pipelines enable the provision of diverse sources of natural gas supplies to the customers of Southern Company Gas. Gas pipeline investments also includes a 20% ownership interest in the PennEast Pipeline project, which was cancelled in September 2021. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.
Through July 1, 2021, wholesale gas services provided natural gas asset management and/or related logistics services for each of Southern Company Gas' utilities except Nicor Gas as well as for non-affiliated companies. Additionally, wholesale gas services engaged in natural gas storage and gas pipeline arbitrage and related activities.
Gas marketing services provides natural gas marketing to end-use customers primarily in Georgia and Illinois through SouthStar.
The all other column includes segments and subsidiaries that fall below the quantitative threshold for separate disclosure, including storage and fuels operations.
Business segment financial data for the three months ended March 31, 2022 and 2021 was as follows:
Gas Distribution OperationsGas Pipeline Investments
Wholesale Gas Services(*)
Gas Marketing ServicesTotalAll OtherEliminationsConsolidated
(in millions)
Three Months Ended March 31, 2022
Operating revenues$1,803 $8 $— $243 $2,054 $16 $(12)$2,058 
Segment net income (loss)
214 29 — 66 309 10 — 319 
Total assets at
March 31, 2022
21,034 1,473 — 1,640 24,147 12,017 (12,787)23,377 
Three Months Ended March 31, 2021
Operating revenues$1,200 $8 $298 $195 $1,701 $7 $(14)$1,694 
Segment net income (loss)183 29 126 56 394 4 — 398 
Total assets at
December 31, 2021
20,917 1,467 31 1,556 23,971 12,114 (12,525)23,560 
(*)As a result of the sale of Sequent, wholesale gas services is no longer a reportable segment for the three months ended March 31, 2022. Prior to the sale of Sequent, the revenues for wholesale gas services were netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table.
Third Party Gross RevenuesIntercompany RevenuesTotal Gross Revenues Less Gross Gas CostsOperating Revenues
(in millions)
Three Months Ended March 31, 2021$2,588 $63 $2,651 $2,353 $298