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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | $ 41 | $ 142
Other comprehensive income before reclassifications |  | (97)
Amounts reclassified from AOCI | (6) | (17)
Other comprehensive loss | (6) | (109)
Income taxes (benefits) on other comprehensive income (loss) | (1) | (53)
Other comprehensive loss, net of tax | (5) | (56)
AOCI Ending Balance | 36 | 86
Gains & Losses on Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | (11) | (22)
Other comprehensive income before reclassifications |  | 0
Amounts reclassified from AOCI | 1 | 2
Deconsolidation of FES and FENOC |  | 13
Other comprehensive loss | 1 | 15
Income taxes (benefits) on other comprehensive income (loss) | 0 | 8
Other comprehensive loss, net of tax | 1 | 7
AOCI Ending Balance | (10) | (15)
Unrealized Gains on AFS Securities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | 0 | 67
Other comprehensive income before reclassifications |  | (97)
Amounts reclassified from AOCI | 0 | (1)
Deconsolidation of FES and FENOC |  | (8)
Other comprehensive loss | 0 | (106)
Income taxes (benefits) on other comprehensive income (loss) | 0 | (39)
Other comprehensive loss, net of tax | 0 | (67)
AOCI Ending Balance | 0 | 0
Defined Benefit Pension & OPEB Plans |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | 52 | 97
Other comprehensive income before reclassifications |  | 0
Amounts reclassified from AOCI | (7) | (18)
Deconsolidation of FES and FENOC |  | 0
Other comprehensive loss | (7) | (18)
Income taxes (benefits) on other comprehensive income (loss) | (1) | (22)
Other comprehensive loss, net of tax | (6) | 4
AOCI Ending Balance | 46 | 101
AOCI |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Deconsolidation of FES and FENOC |  | 5
Other comprehensive loss, net of tax | $ (5) | $ (56)

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