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Taxes (Details 2) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accumulated deferred income taxes |  |
Property basis differences | $ 7,088 | $ 9,920
Deferred sale and leaseback gain | (351) | (360)
Pension and OPEB | (1,347) | (1,541)
Nuclear decommissioning activities | 635 | 480
Asset retirement obligations | (669) | (731)
Regulatory asset/liability | 545 | 763
Deferred compensation | (269) | (239)
Loss carryforwards and AMT credits | (2,251) | (1,965)
Valuation reserve | 438 | 192
All other | (54) | 254
Net deferred income tax liability | 3,765 | 6,773
FES |  |
Accumulated deferred income taxes |  |
Property basis differences | (1,009) | 1,901
Deferred sale and leaseback gain | (328) | (342)
Pension and OPEB | (366) | (393)
Lease market valuation liability | 111 | 95
Nuclear decommissioning activities | 540 | 483
Asset retirement obligations | (453) | (509)
Loss carryforwards and AMT credits | (830) | (687)
Valuation reserve | 197 | 46
All other | (141) | 6
Net deferred income tax liability |  | $ 600
Net deferred income tax liability (asset) | $ (2,279) |

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