Goodwill And Other Intangibles (Expenses Related To Emissions And Renewable Energy Requirements) (Details) (Power [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Power [Member]
Goodwill [Line Items]
Emissions Expense	$ 10	$ 6	$ 5
Renewable Energy Expense	$ 59	$ 26	$ 34