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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | $ 163 | $ 191 | $ 174 | $ 171
Other comprehensive income before reclassifications | 27 | 21 | 63 | 109
Amounts reclassified from AOCI | (48) | (33) | (102) | (90)
Other comprehensive income (loss) | (21) | (12) | (39) | 19
Income taxes (benefits) on other comprehensive income (loss) | (9) | (5) | (16) | 6
Other comprehensive income (loss), net of tax | (12) | (7) | (23) | 13
AOCI Ending Balance | 151 | 184 | 151 | 184
Gains & Losses on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | (26) | (31) | (28) | (33)
Other comprehensive income before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 4 | 2 | 8 | 6
Other comprehensive income (loss) | 4 | 2 | 8 | 6
Income taxes (benefits) on other comprehensive income (loss) | 1 | 0 | 3 | 2
Other comprehensive income (loss), net of tax | 3 | 2 | 5 | 4
AOCI Ending Balance | (23) | (29) | (23) | (29)
Unrealized Gains on AFS Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 61 | 58 | 52 | 18
Other comprehensive income before reclassifications | 27 | 21 | 63 | 109
Amounts reclassified from AOCI | (33) | (17) | (55) | (42)
Other comprehensive income (loss) | (6) | 4 | 8 | 67
Income taxes (benefits) on other comprehensive income (loss) | (3) | 2 | 2 | 25
Other comprehensive income (loss), net of tax | (3) | 2 | 6 | 42
AOCI Ending Balance | 58 | 60 | 58 | 60
Defined Benefit Pension & OPEB Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 128 | 164 | 150 | 186
Other comprehensive income before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | (19) | (18) | (55) | (54)
Other comprehensive income (loss) | (19) | (18) | (55) | (54)
Income taxes (benefits) on other comprehensive income (loss) | (7) | (7) | (21) | (21)
Other comprehensive income (loss), net of tax | (12) | (11) | (34) | (33)
AOCI Ending Balance | 116 | 153 | 116 | 153
FES |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 79 | 75 | 69 | 46
Other comprehensive income before reclassifications | 27 | 22 | 70 | 102
Amounts reclassified from AOCI | (35) | (19) | (63) | (51)
Other comprehensive income (loss) | (8) | 3 | 7 | 51
Income taxes (benefits) on other comprehensive income (loss) | (3) | 1 | 2 | 20
Other comprehensive income (loss), net of tax | (5) | 2 | 5 | 31
AOCI Ending Balance | 74 | 77 | 74 | 77
FES | Gains & Losses on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | (9) | (10) | (9) | (9)
Other comprehensive income before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 1 | 1 | 1 | 0
Other comprehensive income (loss) | 1 | 1 | 1 | 0
Income taxes (benefits) on other comprehensive income (loss) | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 1 | 1 | 1 | 0
AOCI Ending Balance | (8) | (9) | (8) | (9)
FES | Unrealized Gains on AFS Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 62 | 50 | 48 | 16
Other comprehensive income before reclassifications | 27 | 22 | 70 | 102
Amounts reclassified from AOCI | (33) | (17) | (54) | (41)
Other comprehensive income (loss) | (6) | 5 | 16 | 61
Income taxes (benefits) on other comprehensive income (loss) | (2) | 2 | 6 | 24
Other comprehensive income (loss), net of tax | (4) | 3 | 10 | 37
AOCI Ending Balance | 58 | 53 | 58 | 53
FES | Defined Benefit Pension & OPEB Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance | 26 | 35 | 30 | 39
Other comprehensive income before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | (3) | (3) | (10) | (10)
Other comprehensive income (loss) | (3) | (3) | (10) | (10)
Income taxes (benefits) on other comprehensive income (loss) | (1) | (1) | (4) | (4)
Other comprehensive income (loss), net of tax | (2) | (2) | (6) | (6)
AOCI Ending Balance | $ 24 | $ 33 | $ 24 | $ 33

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