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Changes in Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020
Losses on Cash Flow Hedges
 
Pension and
Non-Pension
Postretirement
Benefit Plan
Items (a)
 
Foreign
Currency
Items
 
Total
Beginning balance
$
(3
)
 
$
(3,135
)
 
$
(35
)
 
$
(3,173
)
OCI before reclassifications
—

 
2

 
2

 
4

Amounts reclassified from AOCI
—

 
37

 
—

 
37

Net current-period OCI
—

 
39

 
2

 
41

Ending balance
$
(3
)
 
$
(3,096
)
 
$
(33
)
 
$
(3,132
)
Three Months Ended June 30, 2019
Losses on Cash Flow Hedges
 
Pension and
Non-Pension
Postretirement
Benefit Plan
Items (a)
 
Foreign
Currency
Items
 
AOCI of
Investments in Unconsolidated Affiliates (b)
 
Total
Beginning balance
$
(2
)
 
$
(2,978
)
 
$
(31
)
 
$
(1
)
 
$
(3,012
)
OCI before reclassifications
—

 
(1
)
 
2

 
(1
)
 
—

Amounts reclassified from AOCI
—

 
22

 
—

 
—

 
22

Net current-period OCI
—

 
21

 
2

 
(1
)
 
22

Ending balance
$
(2
)
 
$
(2,957
)
 
$
(29
)
 
$
(2
)
 
$
(2,990
)
Six Months Ended June 30, 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
)
 
(5
)
 
(6
)
 
(12
)
Amounts reclassified from AOCI
—

 
74

 
—

 
74

Net current-period OCI
(1
)
 
69

 
(6
)
 
62

Ending balance
$
(3
)
 
$
(3,096
)
 
$
(33
)
 
$
(3,132
)

Six Months Ended June 30, 2019
Losses on Cash Flow Hedges
 
Pension and
Non-Pension
Postretirement
Benefit Plan
Items (a)
 
Foreign
Currency
Items
 
AOCI of
Investments in Unconsolidated Affiliates (b)
 
Total
Beginning balance
$
(2
)
 
$
(2,960
)
 
$
(33
)
 
$
—

 
$
(2,995
)
OCI before reclassifications
—

 
(39
)
 
4

 
(2
)
 
(37
)
Amounts reclassified from AOCI
—

 
42

 
—

 
—

 
42

Net current-period OCI
—

 
3

 
4

 
(2
)
 
5

Ending balance
$
(2
)
 
$
(2,957
)
 
$
(29
)
 
$
(2
)
 
$
(2,990
)
_________
(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.
(b)
All amounts are net of noncontrolling interests.
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 June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Pension and non-pension postretirement benefit plans:
 
 
 
 
 
 
 
Prior service benefit reclassified to periodic benefit cost
$
4

 
$
6

 
$
8

 
$
12

Actuarial loss reclassified to periodic benefit cost
(17
)
 
(13
)
 
(34
)
 
(26
)
Pension and non-pension postretirement benefit plans valuation adjustment
—

 
—

 
3

 
14