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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | $ 174 | $ 171
Other comprehensive income before reclassifications | 32 | 41
Amounts reclassified from AOCI | (31) | (29)
Other comprehensive income | 1 | 12
Income taxes (benefits) on other comprehensive income (loss) | 0 | 4
Other comprehensive income, net of tax | 1 | 8
AOCI Ending Balance | 175 | 179
Gains & Losses on Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | (28) | (33)
Other comprehensive income before reclassifications | 0 | 0
Amounts reclassified from AOCI | 3 | 2
Other comprehensive income | 3 | 2
Income taxes (benefits) on other comprehensive income (loss) | 1 | 1
Other comprehensive income, net of tax | 2 | 1
AOCI Ending Balance | (26) | (32)
Unrealized Gains on AFS Securities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | 52 | 18
Other comprehensive income before reclassifications | 32 | 41
Amounts reclassified from AOCI | (16) | (13)
Other comprehensive income | 16 | 28
Income taxes (benefits) on other comprehensive income (loss) | 5 | 10
Other comprehensive income, net of tax | 11 | 18
AOCI Ending Balance | 63 | 36
Defined Benefit Pension & OPEB Plans |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | 150 | 186
Other comprehensive income before reclassifications | 0 | 0
Amounts reclassified from AOCI | (18) | (18)
Other comprehensive income | (18) | (18)
Income taxes (benefits) on other comprehensive income (loss) | (6) | (7)
Other comprehensive income, net of tax | (12) | (11)
AOCI Ending Balance | 138 | 175
FES |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | 69 | 46
Other comprehensive income before reclassifications | 31 | 36
Amounts reclassified from AOCI | (18) | (17)
Other comprehensive income | 13 | 19
Income taxes (benefits) on other comprehensive income (loss) | 5 | 7
Other comprehensive income, net of tax | 8 | 12
AOCI Ending Balance | 77 | 58
FES | Gains & Losses on Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | (9) | (9)
Other comprehensive income before reclassifications | 0 | 0
Amounts reclassified from AOCI | 0 | 0
Other comprehensive income | 0 | 0
Income taxes (benefits) on other comprehensive income (loss) | 0 | 0
Other comprehensive income, net of tax | 0 | 0
AOCI Ending Balance | (9) | (9)
FES | Unrealized Gains on AFS Securities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | 48 | 16
Other comprehensive income before reclassifications | 31 | 36
Amounts reclassified from AOCI | (15) | (13)
Other comprehensive income | 16 | 23
Income taxes (benefits) on other comprehensive income (loss) | 6 | 9
Other comprehensive income, net of tax | 10 | 14
AOCI Ending Balance | 58 | 30
FES | Defined Benefit Pension & OPEB Plans |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI Beginning Balance | 30 | 39
Other comprehensive income before reclassifications | 0 | 0
Amounts reclassified from AOCI | (3) | (4)
Other comprehensive income | (3) | (4)
Income taxes (benefits) on other comprehensive income (loss) | (1) | (2)
Other comprehensive income, net of tax | (2) | (2)
AOCI Ending Balance | $ 28 | $ 37

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