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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) | $ (53) | $ 4 | $ (122)
Income taxes (benefits) on other comprehensive income (loss) | (21) | 1 | (47)
Other comprehensive income (loss), net of tax | (32) | 3 | (75)
FES |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 218 |  |
Other comprehensive income (loss) | 18 | 38 | (18)
Income taxes (benefits) on other comprehensive income (loss) | 6 | 15 | (7)
Other comprehensive income (loss), net of tax | 12 | 23 | (11)
Ending Balance | (2,070) | 218 |
Accumulated Other Comprehensive Income |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 174 | 171 | 246
Other comprehensive income before reclassifications | 74 | 119 | 24
Amounts reclassified from AOCI | (127) | (115) | (146)
Other comprehensive income (loss) | (53) | 4 | (122)
Income taxes (benefits) on other comprehensive income (loss) | (21) | 1 | (47)
Other comprehensive income (loss), net of tax | (32) | 3 | (75)
Ending Balance | 142 | 174 | 171
Accumulated Other Comprehensive Income | FES |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 69 | 46 | 57
Other comprehensive income before reclassifications | 91 | 100 | 25
Amounts reclassified from AOCI | (73) | (62) | (43)
Other comprehensive income (loss) | 18 | 38 | (18)
Income taxes (benefits) on other comprehensive income (loss) | 6 | 15 | (7)
Other comprehensive income (loss), net of tax | 12 | 23 | (11)
Ending Balance | 81 | 69 | 46
Gains & Losses on Cash Flow Hedges |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (28) | (33) | (37)
Other comprehensive income before reclassifications | 0 | 0 | 0
Amounts reclassified from AOCI | 10 | 8 | 5
Other comprehensive income (loss) | 10 | 8 | 5
Income taxes (benefits) on other comprehensive income (loss) | 4 | 3 | 1
Other comprehensive income (loss), net of tax | 6 | 5 | 4
Ending Balance | (22) | (28) | (33)
Gains & Losses on Cash Flow Hedges | FES |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (9) | (9) | (7)
Other comprehensive income before reclassifications | 0 | 0 | 0
Amounts reclassified from AOCI | 2 | 0 | (3)
Other comprehensive income (loss) | 2 | 0 | (3)
Income taxes (benefits) on other comprehensive income (loss) | 1 | 0 | (1)
Other comprehensive income (loss), net of tax | 1 | 0 | (2)
Ending Balance | (8) | (9) | (9)
Unrealized Gains on AFS Securities |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 52 | 18 | 25
Other comprehensive income before reclassifications | 85 | 106 | 14
Amounts reclassified from AOCI | (63) | (51) | (25)
Other comprehensive income (loss) | 22 | 55 | (11)
Income taxes (benefits) on other comprehensive income (loss) | 7 | 21 | (4)
Other comprehensive income (loss), net of tax | 15 | 34 | (7)
Ending Balance | 67 | 52 | 18
Unrealized Gains on AFS Securities | FES |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 48 | 16 | 21
Other comprehensive income before reclassifications | 91 | 100 | 15
Amounts reclassified from AOCI | (61) | (48) | (24)
Other comprehensive income (loss) | 30 | 52 | (9)
Income taxes (benefits) on other comprehensive income (loss) | 10 | 20 | (4)
Other comprehensive income (loss), net of tax | 20 | 32 | (5)
Ending Balance | 68 | 48 | 16
Defined Benefit Pension & OPEB Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 150 | 186 | 258
Other comprehensive income before reclassifications | (11) | 13 | 10
Amounts reclassified from AOCI | (74) | (72) | (126)
Other comprehensive income (loss) | (85) | (59) | (116)
Income taxes (benefits) on other comprehensive income (loss) | (32) | (23) | (44)
Other comprehensive income (loss), net of tax | (53) | (36) | (72)
Ending Balance | 97 | 150 | 186
Defined Benefit Pension & OPEB Plans | FES |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 30 | 39 | 43
Other comprehensive income before reclassifications | 0 | 0 | 10
Amounts reclassified from AOCI | (14) | (14) | (16)
Other comprehensive income (loss) | (14) | (14) | (6)
Income taxes (benefits) on other comprehensive income (loss) | (5) | (5) | (2)
Other comprehensive income (loss), net of tax | (9) | (9) | (4)
Ending Balance | $ 21 | $ 30 | $ 39

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