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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | $ 86 | $ 175 | $ 142 | $ 174
Other comprehensive income before reclassifications |  | 4 | (97) | 36
Amounts reclassified from AOCI | (17) | (23) | (34) | (54)
Deconsolidation of FES and FENOC |  |  | 5 |
Other comprehensive loss | (17) | (19) | (126) | (18)
Income taxes (benefits) on other comprehensive income (loss) | (4) | (7) | (57) | (7)
Other comprehensive loss, net of tax | (13) | (12) | (69) | (11)
AOCI Ending Balance | 73 | 163 | 73 | 163
Gains & Losses on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | (15) | (26) | (22) | (28)
Other comprehensive income before reclassifications |  | 0 | 0 | 0
Amounts reclassified from AOCI | 2 | 1 | 4 | 4
Deconsolidation of FES and FENOC |  |  | 13 |
Other comprehensive loss | 2 | 1 | 17 | 4
Income taxes (benefits) on other comprehensive income (loss) | 1 | 1 | 9 | 2
Other comprehensive loss, net of tax | 1 | 0 | 8 | 2
AOCI Ending Balance | (14) | (26) | (14) | (26)
Unrealized Gains on AFS Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 0 | 63 | 67 | 52
Other comprehensive income before reclassifications |  | 4 | (97) | 36
Amounts reclassified from AOCI | 0 | (6) | (1) | (22)
Deconsolidation of FES and FENOC |  |  | (8) |
Other comprehensive loss | 0 | (2) | (106) | 14
Income taxes (benefits) on other comprehensive income (loss) | 0 | 0 | (39) | 5
Other comprehensive loss, net of tax | 0 | (2) | (67) | 9
AOCI Ending Balance | 0 | 61 | 0 | 61
Defined Benefit Pension & OPEB Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 101 | 138 | 97 | 150
Other comprehensive income before reclassifications |  | 0 | 0 | 0
Amounts reclassified from AOCI | (19) | (18) | (37) | (36)
Deconsolidation of FES and FENOC |  |  | 0 |
Other comprehensive loss | (19) | (18) | (37) | (36)
Income taxes (benefits) on other comprehensive income (loss) | (5) | (8) | (27) | (14)
Other comprehensive loss, net of tax | (14) | (10) | (10) | (22)
AOCI Ending Balance | $ 87 | $ 128 | $ 87 | $ 128

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount before tax and reclassification adjustments of 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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- Definition Amount before tax, after reclassification adjustments of 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 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 + Details
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