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Fair Value Measurements (Details 3) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	$ 1,698	$ 1,778
Unrealized Gain	62	16
Fair Value	1,760	1,794
Equity securities
Amortized cost basis, unrealized gains and losses and fair values of investments in available-for-sale securities
Cost Basis	681	542
Unrealized Gains	89	34
Fair Value	770	576
FES | Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	820	801
Unrealized Gain	41	9
Fair Value	861	810
FES | Equity securities
Amortized cost basis, unrealized gains and losses and fair values of investments in available-for-sale securities
Cost Basis	434	354
Unrealized Gains	61	24
Fair Value	$ 495	$ 378

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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