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Financing and Leases (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Credit Arrangements
At June 30, 2022, committed credit arrangements with banks were as follows:
Expires
Company2023202420252026TotalUnusedExpires within
One Year
(in millions)
Southern Company parent$— $— $— $2,000 $2,000 $1,998 $— 
Alabama Power— 550 — 700 1,250 1,250 — 
Georgia Power— — — 1,750 1,750 1,726 — 
Mississippi Power— 150 125 — 275 275 — 
Southern Power(a)
— — — 600 600 568 — 
Southern Company Gas(b)
250 — — 1,500 1,750 1,748 250 
SEGCO30 — — — 30 30 30 
Southern Company$280 $700 $125 $6,550 $7,655 $7,595 $280 
(a)Does not include Southern Power Company's two $75 million continuing letter of credit facilities for standby letters of credit, expiring in 2023 and 2025, respectively, of which $11 million and $5 million, respectively, was unused at June 30, 2022. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities.
(b)Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $800 million of the credit arrangement expiring in 2026. Southern Company Gas' committed credit arrangement expiring in 2026 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangement expiring in 2026, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower of a new $250 million credit arrangement expiring in 2023.
Schedule of Shares Used to Compute Diluted Earnings Per Share Shares used to compute diluted earnings per share were as follows:
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
 (in millions)
As reported shares1,065 1,061 1,064 1,060 
Effect of stock-based compensation5 6 5 6 
Effect of equity units2 — 1 — 
Diluted shares1,072 1,067 1,070 1,066