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Changes in Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2023
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 June 30, 2023 Cash Flow Hedges
Pension and
Non-Pension
Postretirement
Benefit Plan
Items(a)
Foreign
Currency
Items		Total
Balance at March 31, 2023$8 $(647)$— $(639)
OCI before reclassifications9 (3)— 6 
Amounts reclassified from AOCI— 3 — 3 
Net current-period OCI9 — — 9 
Balance at June 30, 2023$17 $(647)$— $(630)
Three Months Ended June 30, 2022 Cash Flow Hedges
Pension and
Non-Pension
Postretirement
Benefit Plan
Items(a)
Foreign
Currency
Items		Total
Balance at March 31, 2022$— $(713)$— $(713)
OCI before reclassifications— 2 — 2 
Amounts reclassified from AOCI— 10 — 10 
Net current-period OCI— 12 — 12 
Balance at June 30, 2022$— $(701)$— $(701)

Six Months Ended June 30, 2023 Cash Flow Hedges
Pension and
Non-Pension
Postretirement
Benefit Plan
Items(a)
Foreign
Currency
Items		Total
Balance at December 31, 2022$2 $(640)$— $(638)
OCI before reclassifications15 (13)— 2 
Amounts reclassified from AOCI— 6 — 6 
Net current-period OCI15 (7)— 8 
Balance at June 30, 2023$17 $(647)$— $(630)
Six Months Ended June 30, 2022Cash Flow Hedges
Pension and
Non-Pension
Postretirement
Benefit Plan
Items(a)
Foreign
Currency
Items		Total
Balance at December 31, 2021$(6)$(2,721)$(23)$(2,750)
Separation of Constellation6 1,994 23 2,023 
OCI before reclassifications— 2 — 2 
Amounts reclassified from AOCI— 24 — 24 
Net current-period OCI— 26 — 26 
Balance at June 30, 2022$— $(701)$— $(701)
__________(a)This AOCI component is included in the computation of net periodic pension and OPEB cost. Additionally, as of February 1, 2022, in connection with the separation, Exelon's pension and OPEB plans were remeasured. See Note 14 — Retirement Benefits of the 2022 Form 10-K and Note 8 — Retirement Benefits for additional information. See Exelon's Statements of Operations and Comprehensive Income for individual components of AOCI.
Schedule of Income Taxes Allocated to Other Comprehensive Income (Loss) Components
The following table presents Income tax benefit (expense) allocated to each component of Exelon's Other comprehensive income (loss):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Pension and non-pension postretirement benefit plans:
Actuarial loss reclassified to periodic benefit cost$(1)$(3)$(2)$(8)
Pension and non-pension postretirement benefit plans valuation adjustment1 (1)4 — 
Unrealized gain on cash flow hedges(3)— (4)—