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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | $ 191 | $ 202 | $ 171 | $ 246
Other comprehensive income (loss) before reclassifications | 21 | (8) | 109 | (1)
Amounts reclassified from AOCI | (33) | (32) | (90) | (110)
Other comprehensive income (loss) | (12) | (40) | 19 | (111)
Income taxes (benefits) on other comprehensive income (loss) | (5) | (15) | 6 | (42)
Other comprehensive income (loss), net of tax | (7) | (25) | 13 | (69)
AOCI Ending Balance | 184 | 177 | 184 | 177
FES |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 75 | 45 | 46 | 57
Other comprehensive income (loss) before reclassifications | 22 | (7) | 102 | (1)
Amounts reclassified from AOCI | (19) | (8) | (51) | (33)
Other comprehensive income (loss) | 3 | (15) | 51 | (34)
Income taxes (benefits) on other comprehensive income (loss) | 1 | (6) | 20 | (13)
Other comprehensive income (loss), net of tax | 2 | (9) | 31 | (21)
AOCI Ending Balance | 77 | 36 | 77 | 36
Gains & Losses on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | (31) | (36) | (33) | (37)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 2 | 2 | 6 | 4
Other comprehensive income (loss) | 2 | 2 | 6 | 4
Income taxes (benefits) on other comprehensive income (loss) | 0 | 1 | 2 | 2
Other comprehensive income (loss), net of tax | 2 | 1 | 4 | 2
AOCI Ending Balance | (29) | (35) | (29) | (35)
Gains & Losses on Cash Flow Hedges | FES |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | (10) | (9) | (9) | (7)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 1 | 0 | 0 | (2)
Other comprehensive income (loss) | 1 | 0 | 0 | (2)
Income taxes (benefits) on other comprehensive income (loss) | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 1 | 0 | 0 | (2)
AOCI Ending Balance | (9) | (9) | (9) | (9)
Unrealized Gains on AFS Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 58 | 19 | 18 | 25
Other comprehensive income (loss) before reclassifications | 21 | (8) | 109 | (1)
Amounts reclassified from AOCI | (17) | (3) | (42) | (20)
Other comprehensive income (loss) | 4 | (11) | 67 | (21)
Income taxes (benefits) on other comprehensive income (loss) | 2 | (4) | 25 | (8)
Other comprehensive income (loss), net of tax | 2 | (7) | 42 | (13)
AOCI Ending Balance | 60 | 12 | 60 | 12
Unrealized Gains on AFS Securities | FES |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 50 | 16 | 16 | 21
Other comprehensive income (loss) before reclassifications | 22 | (7) | 102 | (1)
Amounts reclassified from AOCI | (17) | (4) | (41) | (19)
Other comprehensive income (loss) | 5 | (11) | 61 | (20)
Income taxes (benefits) on other comprehensive income (loss) | 2 | (5) | 24 | (9)
Other comprehensive income (loss), net of tax | 3 | (6) | 37 | (11)
AOCI Ending Balance | 53 | 10 | 53 | 10
Defined Benefit Pension & OPEB Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 164 | 219 | 186 | 258
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | (18) | (31) | (54) | (94)
Other comprehensive income (loss) | (18) | (31) | (54) | (94)
Income taxes (benefits) on other comprehensive income (loss) | (7) | (12) | (21) | (36)
Other comprehensive income (loss), net of tax | (11) | (19) | (33) | (58)
AOCI Ending Balance | 153 | 200 | 153 | 200
Defined Benefit Pension & OPEB Plans | FES |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 35 | 38 | 39 | 43
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | (3) | (4) | (10) | (12)
Other comprehensive income (loss) | (3) | (4) | (10) | (12)
Income taxes (benefits) on other comprehensive income (loss) | (1) | (1) | (4) | (4)
Other comprehensive income (loss), net of tax | (2) | (3) | (6) | (8)
AOCI Ending Balance | $ 33 | $ 35 | $ 33 | $ 35

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