Changes in Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2022

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, 2022	Cash Flow Hedges		Pension and Non-Pension Postretirement Benefit Plan Items(a)		Foreign Currency Items		Total
Balance at December 31, 2021	$	(6)	$	(2,721)	$	(23)	$	(2,750)
Separation of Constellation	6		1,994		23		2,023
Amounts reclassified from AOCI	—		14		—		14
Net current-period OCI	—		14		—		14
Balance at March 31, 2022	$	—	$	(713)	$	—	$	(713)

Three Months Ended March 31, 2021	Losses on Cash Flow Hedges		Pension and Non-Pension Postretirement Benefit Plan Items(a)		Foreign Currency Items		Total
Balance at December 31, 2020	$	(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
Balance at March 31, 2021	$	(5)	$	(3,319)	$	(22)	$	(3,346)

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(a)This AOCI component is included in the computation of net periodic pension and OPEB cost. Additionally, as of February 1, 2022, in connection with the separation, Exelon's pension and OPEB plans were remeasured. See Note 8 — Retirement Benefits for additional information. See Exelon's Statements of Operations and Comprehensive Income for individual components of AOCI.

Schedule of Income Taxes Allocated to Other Comprehensive Income (Loss) Components

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

	Three Months Ended March 31,
	2022		2021
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost	$	—	$	1
Actuarial loss reclassified to periodic benefit cost	(5)		(19)