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Changes in Accumulated Other Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 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 September 30, 2021Losses on Cash Flow Hedges
Pension and
Non-Pension
Postretirement
Benefit Plan
Items(a)
Foreign
Currency
Items
Total
Beginning balance$(5)$(3,264)$(20)$(3,289)
OCI before reclassifications— 14 (3)11 
Amounts reclassified from AOCI— 55 — 55 
Net current-period OCI— 69 (3)66 
Ending balance$(5)$(3,195)$(23)$(3,223)
Three Months Ended September 30, 2020Losses on Cash Flow Hedges
Pension and
Non-Pension
Postretirement
Benefit Plan
Items(a)
Foreign
Currency
Items
Total
Beginning balance$(3)$(3,096)$(33)$(3,132)
OCI before reclassifications(1)(13)(11)
Amounts reclassified from AOCI— 39 — 39 
Net current-period OCI(1)26 28 
Ending balance$(4)$(3,070)$(30)$(3,104)
Nine Months Ended September 30, 2021Losses 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(1)15 — 14 
Amounts reclassified from AOCI— 163 — 163 
Net current-period OCI(1)178 — 177 
Ending balance$(6)$(3,194)$(23)$(3,223)
Nine Months Ended September 30, 2020Losses 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(2)(17)(3)(22)
Amounts reclassified from AOCI— 112 — 112 
Net current-period OCI(2)95 (3)90 
Ending balance$(4)$(3,070)$(30)$(3,104)
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(a)AOCI amounts are included in the computation of net periodic pension and OPEB cost. See Note 11 — 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 September 30,Nine Months Ended September 30,
2021202020212020
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost$$$$12 
Actuarial loss reclassified to periodic benefit cost(19)(16)(57)(50)
Pension and non-pension postretirement benefit plans valuation adjustment(7)(8)