Fair Value (Fair Value of Fixed Income Securities Held in Nuclear Decommissioning Trust Funds (Details) - Nuclear decommissioning trusts - Fixed Income Securities $ in Millions	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 29
Due after one through five years	89
Due after five through ten years	113
Due after ten years	271
Fixed income securities total	$ 502

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