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Changes in Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 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 years ended December 31, 2018 and 2017:
For the Year Ended December 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 Unconsolidated Affiliates |  | Total
Exelon(a) |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | (14 | ) |  | $ | 10 |  |  | $ | (2,998 | ) |  | $ | (23 | ) |  | $ | (1 | ) |  | $ | (3,026 | )
OCI before reclassifications | 11 |  |  | — |  |  | (143 | ) |  | (10 | ) |  | 1 |  |  | (141 | )
Amounts reclassified from AOCI(b) | 1 |  |  | — |  |  | 181 |  |  | — |  |  | — |  |  | 182 |
Net current-period OCI | 12 |  |  | — |  |  | 38 |  |  | (10 | ) |  | 1 |  |  | 41 |
Impact of adoption of Recognition and Measurement of Financial Assets and Financial Liabilities standard(c) | — |  |  | (10 | ) |  | — |  |  | — |  |  | — |  |  | (10 | )
Ending balance | $ | (2 | ) |  | $ | — |  |  | $ | (2,960 | ) |  | $ | (33 | ) |  | $ | — |  |  | $ | (2,995 | )
Generation(a) |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | (16 | ) |  | $ | 3 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | (1 | ) |  | $ | (37 | )
OCI before reclassifications | 11 |  |  | — |  |  | — |  |  | (10 | ) |  | — |  |  | 1 |
Amounts reclassified from AOCI(b) | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |
Net current-period OCI | 12 |  |  | — |  |  | — |  |  | (10 | ) |  | — |  |  | 2 |
Impact of adoption of Recognition and Measurement of Financial Assets and Financial Liabilities standard(c) | — |  |  | (3 | ) |  | — |  |  | — |  |  | — |  |  | (3 | )
Ending balance | $ | (4 | ) |  | $ | — |  |  | $ | — |  |  | $ | (33 | ) |  | $ | (1 | ) |  | $ | (38 | )
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 Financial Liabilities standard(c) | — |  |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | (1 | )
Ending balance | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
For the Year Ended December 31, 2017 | Gains and (Losses) on Cash Flow Hedges |  | Unrealized Gains on Marketable Securities |  | Pension and Non-Pension Postretirement Benefit Plan items |  | Foreign Currency Items |  | AOCI of Investments Unconsolidated Affiliates |  | Total
Exelon(a) |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | (17 | ) |  | $ | 4 |  |  | $ | (2,610 | ) |  | $ | (30 | ) |  | $ | (7 | ) |  | $ | (2,660 | )
OCI before reclassifications | (1 | ) |  | 6 |  |  | 11 |  |  | 7 |  |  | 6 |  |  | 29 |
Amounts reclassified from AOCI(b) | 4 |  |  | — |  |  | 140 |  |  | — |  |  | — |  |  | 144 |
Net current-period OCI | 3 |  |  | 6 |  |  | 151 |  |  | 7 |  |  | 6 |  |  | 173 |
Impact of adoption of Reclassification of Certain Tax Effects from AOCI(d) | — |  |  | — |  |  | (539 | ) |  | — |  |  | — |  |  | (539 | )
Ending balance | $ | (14 | ) |  | $ | 10 |  |  | $ | (2,998 | ) |  | $ | (23 | ) |  | $ | (1 | ) |  | $ | (3,026 | )
Generation(a) |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | (19 | ) |  | $ | 2 |  |  | $ | — |  |  | $ | (30 | ) |  | $ | (7 | ) |  | $ | (54 | )
OCI before reclassifications | (1 | ) |  | 1 |  |  | — |  |  | 7 |  |  | 6 |  |  | 13 |
Amounts reclassified from AOCI(b) | 4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |
Net current-period OCI | 3 |  |  | 1 |  |  | — |  |  | 7 |  |  | 6 |  |  | 17 |
Ending balance | $ | (16 | ) |  | $ | 3 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | (1 | ) |  | $ | (37 | )
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 interests. 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 Financial 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 1 — Significant Accounting Policies 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 1 — Significant Accounting Policies 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 years ended December 31, 2018 and 2017: For the Year Ended December 31, 2018
Details about AOCI components |  | Items reclassified out of AOCI(a) |  | Affected line item in the Statement of Operations and Comprehensive Income
|  | Exelon |  | Generation |  |
Gains (Losses) on cash flow hedges |  |  |  |  |  |
Other cash flow hedges |  | $ | (1 | ) |  | $ | (1 | ) |  | Interest expense
|  | (1 | ) |  | (1 | ) |  | Total before tax
|  | — |  |  | — |  |  | Tax benefit
|  | $ | (1 | ) |  | $ | (1 | ) |  | Net of tax
Amortization of pension and other postretirement benefit plan items
Prior service costs(b) |  | $ | 90 |  |  | $ | — |  |  |
Actuarial losses(b) |  | (333 | ) |  | — |  |  |
|  | (243 | ) |  | — |  |  | Total before tax
|  | 62 |  |  | — |  |  | Tax benefit
|  | $ | (181 | ) |  | $ | — |  |  | Net of tax
Total Reclassifications |  | $ | (182 | ) |  | $ | (1 | ) |  | Net of tax
For the Year Ended December 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 (Losses) on cash flow hedges |  |  |  |  |  |
Other cash flow hedges |  | $ | (5 | ) |  | $ | (5 | ) |  | Interest expense
|  | (5 | ) |  | (5 | ) |  | Total before tax
|  | 1 |  |  | 1 |  |  | Tax benefit
|  | $ | (4 | ) |  | $ | (4 | ) |  | Net of tax
Amortization of pension and other postretirement benefit plan items |  |  |  |  |  |
Prior service costs(b) |  | $ | 92 |  |  | $ | — |  |  |
Actuarial losses(b) |  | (324 | ) |  | — |  |  |
|  | (232 | ) |  | — |  |  | Total before tax
|  | 92 |  |  | — |  |  | Tax benefit
|  | $ | (140 | ) |  | $ | — |  |  | Net of tax
Total Reclassifications |  | $ | (144 | ) |  | $ | (4 | ) |  | Net of tax
__________
(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 16 — Retirement Benefits for additional information.
Schedule of Other Comprehensive Income Loss Tax | The following table presents income tax benefit (expense) allocated to each component of other comprehensive income (loss) during the years ended December 31, 2018, 2017 and 2016:
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Exelon |  |  |  |  |
Pension and non-pension postretirement benefit plans: |  |  |  |  |
Prior service benefit reclassified to periodic benefit cost | $ | 24 |  |  | $ | 36 |  |  | $ | 30 |
Actuarial loss reclassified to periodic benefit cost | (86 | ) |  | (128 | ) |  | (118 | )
Pension and non-pension postretirement benefit plans valuation adjustment | 50 |  |  | 13 |  |  | 115 |
Change in unrealized gains on cash flow hedges | (5 | ) |  | (7 | ) |  | — |
Change in unrealized gains (losses) on investments in unconsolidated affiliates | — |  |  | (3 | ) |  | 3 |
Change in unrealized gains on marketable securities | — |  |  | (1 | ) |  | — |
Total | $ | (17 | ) |  | $ | (90 | ) |  | $ | 30 |
Generation |  |  |  |  |
Change in unrealized gains on cash flow hedges | $ | (4 | ) |  | $ | (6 | ) |  | $ | (2 | )
Change in unrealized gains (losses) on investments in unconsolidated affiliates | (1 | ) |  | (3 | ) |  | 3 |
Change in unrealized gains on marketable securities | — |  |  | (1 | ) |  | — |
Total | $ | (5 | ) |  | $ | (10 | ) |  | $ | 1 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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