Fair Value Fair Value (Fair Value of Fixed Income Securities Held in Nuclear Decommissioning Trust Funds (Details) - Fixed income securities - Nuclear decommissioning trust fund $ in Millions	Jun. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 24
Due after one through five years	103
Due after five through ten years	113
Due after ten years	287
Available-for-sale securities total	$ 527

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