Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Regulated Operations [Abstract]

Regulatory Assets and Liabilities

The Company has recorded regulatory assets and liabilities (in millions) that it expects to pass through to its customers in accordance with, and subject to, regulatory provisions as follows:

December 31,	2020		2019		Recovery/Refund Period
Regulatory assets
Current regulatory assets:
El Salvador energy pass through costs recovery	$	40	$	56	Quarterly
Other	73		57		1 year
Total current regulatory assets	113		113
Noncurrent regulatory assets:
IPL and DPL defined benefit pension obligations (1)	244		262		Various
IPL environmental costs	81		85		Various
IPL Petersburg Unit 1 retirement costs	75		—		Over life of assets
IPL deferred Midwest ISO costs	61		75		6 years
Other	126		108		Various
Total noncurrent regulatory assets	587		530
Total regulatory assets	$	700	$	643
Regulatory liabilities
Current regulatory liabilities:
Overcollection of costs to be passed back to customers	$	47	$	80	1 year
Other	1		1		Various
Total current regulatory liabilities	48		81
Noncurrent regulatory liabilities:
IPL and DPL accrued costs of removal and AROs	863		863		Over life of assets
IPL and DPL income taxes payable to customers through rates	174		209		Various
Other	21		18		Various
Total noncurrent regulatory liabilities	1,058		1,090
Total regulatory liabilities	$	1,106	$	1,171

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(1)Past expenditures on which the Company earns a rate of return.