Significant Accounting Policies (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Significant Accounting Policies [Line Items]
Other Nonoperating Income	$ 41	$ 44
Effective Income Tax Rate, Continuing Operations	33.00%	31.00%
Increase in Effective Tax Rate	2.00%
Other Information Pertaining to Income Taxes	8
Unrecognized Tax Benefits that would impact Effective Tax Rate	2
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecognized Benefit	1
Minimum [Member]
Significant Accounting Policies [Line Items]
Finite Lived Asset Useful Life	1 year
Maximum [Member]
Significant Accounting Policies [Line Items]
Finite Lived Asset Useful Life	28 years
Power and Industrial Projects [Member]
Significant Accounting Policies [Line Items]
Other Nonoperating Income	$ 17	$ 15