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Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 6,814 | $ 3,925 | $ 6,241
Other comprehensive income before reclassifications | (2) | (106) | 74
Amounts reclassified from AOCI | (27) | (67) | (127)
Deconsolidation of FES and FENOC |  | 5 |
Other comprehensive income (loss) | (29) | (168) | (53)
Income tax benefits on other comprehensive loss | (8) | (67) | (21)
Other comprehensive loss, net of tax | (21) | (101) | (32)
Ending Balance | 6,975 | 6,814 | 3,925
Accumulated Other Comprehensive Income |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 41 | 142 | 174
Other comprehensive loss, net of tax | (21) | (101) | (32)
Ending Balance | 20 | 41 | 142
Gains & Losses on Cash Flow Hedges |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (11) | (22) | (28)
Other comprehensive income before reclassifications | 0 | 0 | 0
Amounts reclassified from AOCI | 2 | 8 | 10
Deconsolidation of FES and FENOC |  | 13 |
Other comprehensive income (loss) | 2 | 21 | 10
Income tax benefits on other comprehensive loss | 0 | 10 | 4
Other comprehensive loss, net of tax | 2 | 11 | 6
Ending Balance | (9) | (11) | (22)
Unrealized Gains on AFS Securities |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 0 | 67 | 52
Other comprehensive income before reclassifications | 0 | (97) | 85
Amounts reclassified from AOCI | 0 | (1) | (63)
Deconsolidation of FES and FENOC |  | (8) |
Other comprehensive income (loss) | 0 | (106) | 22
Income tax benefits on other comprehensive loss | 0 | (39) | 7
Other comprehensive loss, net of tax | 0 | (67) | 15
Ending Balance | 0 | 0 | 67
Defined Benefit Pension & OPEB Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 52 | 97 | 150
Other comprehensive income before reclassifications | (2) | (9) | (11)
Amounts reclassified from AOCI | (29) | (74) | (74)
Deconsolidation of FES and FENOC |  | 0 |
Other comprehensive income (loss) | (31) | (83) | (85)
Income tax benefits on other comprehensive loss | (8) | (38) | (32)
Other comprehensive loss, net of tax | (23) | (45) | (53)
Ending Balance | $ 29 | $ 52 | $ 97

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- Definition The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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