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Taxes (Details 2) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accumulated deferred income taxes
Property basis differences	$ 4,737	$ 4,354
Pension and OPEB	(629)	(708)
TMI-2 nuclear decommissioning	82	37
AROs	(215)	(157)
Regulatory asset/liability	414	416
Deferred compensation	(170)	(149)
Estimated worthless stock deduction	(1,004)	0
Loss carryforwards and AMT credits	(899)	(863)
Valuation reserve	394	312
All other	(208)	(71)
Net deferred income tax liability	$ 2,502	$ 3,171

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