Changes in Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2021

Changes in Accumulated Other Comprehensive Income [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Income (Loss)

The following tables present changes in Exelon's AOCI, net of tax, by component:

Three Months Ended March 31, 2021	Losses on Cash Flow Hedges		Pension and Non-Pension Postretirement Benefit Plan Items (a)		Foreign Currency Items		Total
Beginning balance	$	(5)	$	(3,372)	$	(23)	$	(3,400)
OCI before reclassifications	—		(2)		1		(1)
Amounts reclassified from AOCI	—		55		—		55
Net current-period OCI	—		53		1		54
Ending balance	$	(5)	$	(3,319)	$	(22)	$	(3,346)

Three Months Ended March 31, 2020	Losses on Cash Flow Hedges		Pension and Non-Pension Postretirement Benefit Plan Items (a)		Foreign Currency Items		Total
Beginning balance	$	(2)	$	(3,165)	$	(27)	$	(3,194)
OCI before reclassifications	(1)		(7)		(8)		(16)
Amounts reclassified from AOCI	—		37		—		37
Net current-period OCI	(1)		30		(8)		21
Ending balance	$	(3)	$	(3,135)	$	(35)	$	(3,173)

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(a)AOCI amounts are included in the computation of net periodic pension and OPEB cost. See Note 10 — Retirement Benefits for additional information. See Exelon's Statements of Operations and Comprehensive Income for individual components of AOCI.

Schedule Of Other Comprehensive Income (Loss) Tax

The following table presents income tax benefit (expense) allocated to each component of Exelon's other comprehensive income (loss):

	Three Months Ended March 31,
	2021		2020
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost	$	1	$	4
Actuarial loss reclassified to periodic benefit cost	(19)		(17)
Pension and non-pension postretirement benefit plans valuation adjustment	—		3