Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Regulatory Assets and Liabilities

At December 31, 2018 and 2017, the environmental remediation liability and the balance of under recovered environmental remediation costs were reflected in the balance sheets as follows:

	Southern Company		Georgia Power		Southern Company Gas
	(in millions)
December 31, 2018:
Environmental remediation liability:
Other current liabilities	$	49	$	23	$	26
Accrued environmental remediation	268		—		268
Under recovered environmental remediation costs:
Other regulatory assets, current	$	21	$	2	$	19
Other regulatory assets, deferred	345		53		292
December 31, 2017:
Environmental remediation liability:
Other current liabilities	$	73	$	22	$	46
Accrued environmental remediation(*)	389		—		342
Under recovered environmental remediation costs:
Other regulatory assets, current	$	38	$	2	$	31
Other regulatory assets, deferred	473		47		379