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Changes in Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
Changes in Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following tables present changes in accumulated other comprehensive income (loss) (AOCI) by component for the three months ended March 31, 2018 and 2017:
Three Months Ended March 31, 2018
Gains 
and
(losses) 
on Cash Flow Hedges
 
Unrealized
Gains and
(losses) on
Marketable
Securities
 
Pension and
Non-Pension
Postretirement
Benefit Plan
Items
 
Foreign
Currency
Items
 
AOCI of
Investments in Unconsolidated Affiliates
 
Total
Exelon(a)
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
(14
)
 
$
10

 
$
(2,998
)
(d) 
$
(23
)
 
$
(1
)
 
$
(3,026
)
OCI before reclassifications
8

 
—

 
18

 
1

 
—

 
27

Amounts reclassified from AOCI(b)
—

 
—

 
44

 
—

 
—

 
44

Net current-period OCI
8

 
—

 
62

 
1

 
—

 
71

Impact of adoption of Recognition and Measurement of Financial Assets and Liabilities standard
—

 
(10
)
(c) 
—

 
—

 
—

 
(10
)
Ending balance
$
(6
)
 
$
—

 
$
(2,936
)
 
$
(22
)
 
$
(1
)
 
$
(2,965
)
Generation(a)
 
 
 
 
 
 
 
 
 
 


Beginning balance
$
(16
)
 
$
3

 
$
—

 
$
(23
)
 
$
(1
)
 
$
(37
)
OCI before reclassifications
7

 
—

 
—

 
(1
)
 
—

 
6

Amounts reclassified from AOCI(b)
—

 
—

 
—

 
—

 
—

 
—

Net current-period OCI
7

 
—

 
—

 
(1
)
 
—

 
6

Impact of adoption of Recognition and Measurement of Financial Assets and Liabilities standard
—

 
(3
)
(c) 
—

 
—

 
—

 
(3
)
Ending balance
$
(9
)
 
$
—

 
$
—

 
$
(24
)
 
$
(1
)
 
$
(34
)
PECO(a)
 
 
 
 
 
 
 
 
 
 

Beginning balance
$
—

 
$
1

 
$
—

 
$
—

 
$
—

 
$
1

OCI before reclassifications
—

 
—

 
—

 
—

 
—

 
—

Amounts reclassified from AOCI(b)
—

 
—

 
—

 
—

 
—

 
—

Net current-period OCI
—

 
—

 
—

 
—

 
—

 
—

Impact of adoption of Recognition and Measurement of Financial Assets and Liabilities standard
—

 
(1
)
(c) 
—

 
—

 
—

 
(1
)
Ending balance
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Three Months Ended March 31, 2017
Gains 
and
(losses) 
on Cash Flow Hedges
 
Unrealized
Gains and
(losses) on
Marketable
Securities
 
Pension and
Non-Pension
Postretirement
Benefit Plan
Items
 
Foreign
Currency
Items
 
AOCI of
Investments in Unconsolidated Affiliates
 
Total
Exelon(a)
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
$
(17
)
 
$
4

 
$
(2,610
)
 
$
(30
)
 
$
(7
)
 
$
(2,660
)
OCI before reclassifications
2

 
1

 
(59
)
 
1

 
5

 
(50
)
Amounts reclassified from AOCI(b)
4

 
—

 
36

 
—

 
—

 
40

Net current-period OCI
6

 
1

 
(23
)
 
1

 
5

 
(10
)
Ending balance
$
(11
)
 
$
5

 
$
(2,633
)
 
$
(29
)
 
$
(2
)
 
$
(2,670
)
Generation(a)
 
 
 
 
 
 
 
 
 
 

Beginning balance
$
(19
)
 
$
2

 
$
—

 
$
(30
)
 
$
(7
)
 
$
(54
)
OCI before reclassifications
2

 
—

 
—

 
1

 
6

 
9

Amounts reclassified from AOCI(b)
4

 
—

 
—

 
—

 
—

 
4

Net current-period OCI
6

 
—

 
—

 
1

 
6

 
13

Ending balance
$
(13
)
 
$
2

 
$
—

 
$
(29
)
 
$
(1
)
 
$
(41
)
PECO(a)
 
 
 
 
 
 
 
 
 
 


Beginning balance
$
—

 
$
1

 
$
—

 
$
—

 
$
—

 
$
1

OCI before reclassifications
—

 
—

 
—

 
—

 
—

 
—

Amounts reclassified from AOCI(b)
—

 
—

 
—

 
—

 
—

 
—

Net current-period OCI
—

 
—

 
—

 
—

 
—

 
—

Ending balance
$
—

 
$
1

 
$
—

 
$
—

 
$
—

 
$
1

_________
(a)
All amounts are net of tax and noncontrolling interest. Amounts in parenthesis represent a decrease in AOCI.
(b)
See next tables for details about these reclassifications.
(c)
Exelon prospectively adopted the new standard Recognition and Measurement of Financial Assets and Liabilities, The standard was adopted as of January 1, 2018, which resulted in an increase to Retained earnings and Accumulated other comprehensive loss of $10 million, $3 million and $1 million for Exelon, Generation and PECO, respectively. The amounts reclassified related to Rabbi Trusts. See Note 2 — New Accounting Standards for additional information.
(d)
Exelon early adopted the new standard Reclassification of Certain Tax Effects from AOCI. The standard was adopted retrospectively as of December 31, 2017, which resulted in an increase to Exelon’s Retained earnings and Accumulated other comprehensive loss of $539 million, primarily related to deferred income taxes associated with Exelon’s pension and OPEB obligations. See Note 2 — New Accounting Standards for additional information.
Reclassification out of Accumulated Other Comprehensive Income
The following tables present amounts reclassified out of AOCI to Net income for Exelon and Generation during the three months ended March 31, 2018 and 2017.
 
 
 
 
 
Three Months Ended March 31, 2018
Details about AOCI components
 
Items reclassified out of AOCI(a)
 
Affected line item in the Statement of Operations and Comprehensive Income
 
 
Exelon
 
 
Amortization of pension and other postretirement benefit plan items
 
 
 
 
Prior service costs(b)
 
$
23

 
 
Actuarial losses(b)
 
(83
)
 
 
Total before tax
 
(60
)
 
 
Tax benefit
 
16

 
 
Net of tax
 
$
(44
)
 
 
 
 
 
 
 
Total Reclassifications
 
$
(44
)
 
Comprehensive income
 
 
 
 
 
Three Months Ended March 31, 2017
Details about AOCI components
 
Items reclassified out of AOCI(a)
 
Affected line item in the Statement of Operations and Comprehensive Income
 
 
Exelon
 
Generation
 
 
Gains and (losses) on cash flow hedges
 
 
 
 
 
 
Other cash flow hedges
 
$
(7
)
 
$
(7
)
 
Interest expense
Total before tax
 
(7
)

(7
)

 
Tax benefit
 
3

 
3

 
 
Net of tax
 
$
(4
)
 
$
(4
)
 
Comprehensive income
 
 
 
 
 
 
 
Amortization of pension and other postretirement benefit plan items
 
 
 
 
 
 
Prior service costs(b)
 
$
23

 
$
—

 
 
Actuarial losses(b)
 
(81
)
 
—

 
 
Total before tax
 
(58
)
 
—

 
 
Tax benefit
 
22

 
—

 
 
Net of tax
 
$
(36
)
 
$
—

 
 
 
 
 
 
 
 
 
Total Reclassifications
 
$
(40
)
 
$
(4
)
 
Comprehensive income
_________
(a)
Amounts in parenthesis represent a decrease in net income.
(b)
This AOCI component is included in the computation of net periodic pension and OPEB cost (see Note 14 — Retirement Benefits for additional details).
Schedule Of Other Comprehensive Income Loss Tax
The following table presents income tax expense (benefit) allocated to each component of other comprehensive income (loss) during the three months ended March 31, 2018 and 2017:
 
Three Months Ended
March 31,
 
2018
 
2017
Exelon
 
 
 
Pension and non-pension postretirement benefit plans:
 
 
 
Prior service benefit reclassified to periodic benefit cost
$
6

 
$
10

Actuarial loss reclassified to periodic benefit cost
(22
)
 
(32
)
Pension and non-pension postretirement benefit plans valuation adjustment
(7
)
 
—

Change in unrealized (loss) on cash flow hedges
(3
)
 
(1
)
Change in unrealized (loss) on investments in unconsolidated affiliates
(1
)
 
(4
)
Change in unrealized (loss) on marketable securities
—

 
(1
)
Total
$
(27
)
 
$
(28
)
 
 
 
 
Generation
 
 
 
Change in unrealized (loss) on cash flow hedges
$
(3
)
 
$
(1
)
Change in unrealized (loss) on investments in unconsolidated affiliates
(1
)
 
(3
)
Total
$
(4
)
 
$
(4
)