STATEMENTS OF CONSOLIDATED EQUITY (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
STATEMENTS OF CONSOLIDATED EQUITY
Natural gas, tax (in dollars)	$ (50,200)	$ (61,757)	$ 110,186
Interest rate, tax (in dollars)	63	4,833	(5,720)
Pension and other post-retirement benefits liability adjustment, tax (benefit) expense	$ 16,115	$ (1,992)	$ (2,752)
Dividends (in dollars per share)	$ 0.12	$ 0.88	$ 0.88
Distributions to noncontrolling interests (in dollars per common unit)	$ 1.55	$ 0.35
Common stock, authorized shares	320,000,000	320,000,000	320,000,000
Preferred shares, authorized	3,000,000	3,000,000	3,000,000
Preferred shares issued	0	0	0
Preferred shares outstanding	0	0	0