Significant Accounting Policy Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, net of tax, related to discontinued operations	$ 258,250
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	42,493,000	76,761,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(133,889,000)	(310,743,000)	(155,932,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	53,990,000	121,484,000	60,925,000
Defined Benefit Plan, Actuarial Net (Gains) Losses	86,481,000	106,299,000	119,262,000
Net periodic (benefit) cost	93,799,000	52,446,000	71,470,000
Actuarially Determined Long-Term Liability Tax Expense	(35,806,000)	(19,720,000)	(27,416,000)
Defined Benefit Plan, Service Cost	(32,164,000)	(53,853,000)	(47,792,000)
Actuarially Long-Term Liabilities Net of Tax	57,993,000	32,726,000	44,054,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(367,610,000)	(824,103,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(325,117,000)	(747,342,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	185,881,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	236,344,000
Other Comprehensive Income (Loss), Net of Tax	422,225,000	54,212,000	72,784,000
Commodity Contract [Member] | Cash Flow Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	(79,899,000)	(189,259,000)	(95,007,000)
Pension Plan, Defined Benefit [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined Benefit Plan, Actuarial Net (Gains) Losses	(82,718,000)	90,502,000
Defined Benefit Plan, Net Periodic Benefit Cost	39,482,000	0	0
Net periodic (benefit) cost	81,230,000	58,099,000	54,115,000
Defined Benefit Plan, Service Cost	(1,611,000)	(1,630,000)	(666,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	282,008,000	488,897,000
Postretirement Benefit Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	140,250,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	316,243,000
Other Comprehensive Income (Loss), Net of Tax	456,493,000
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	45,631,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(79,899,000)
Other Comprehensive Income (Loss), Net of Tax	$ (34,268,000)