Nuclear Decommissioning Trust Fund Investments (Fair Value And The Gross Unrealized Losses Of The Available-For-Sale Securities Held In Nuclear Decommissioning Trust Fund) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Nuclear Decommissioning Trust Fund Investments [Line Items]
Less than 12 months, fair value	$ 78
Less than 12 months, gross unrealized losses	2
12 months or greater, fair value	7
12 months or greater, gross unrealized losses	4
Total, fair value	85
Total, gross unrealized losses	6
Debt Securities
Nuclear Decommissioning Trust Fund Investments [Line Items]
Less than 12 months, fair value	72
Less than 12 months, gross unrealized losses	2
Total, fair value	72
Total, gross unrealized losses	2
Equity Securities
Nuclear Decommissioning Trust Fund Investments [Line Items]
Less than 12 months, fair value	6
12 months or greater, fair value	7
12 months or greater, gross unrealized losses	4
Total, fair value	13
Total, gross unrealized losses	$ 4