Comprehensive Income (Reconciliation Of Net Income (Loss) To Other Comprehensive Income) (Details) (USD $)	3 Months Ended								12 Months Ended							12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2011 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2010 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2009 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2012 Comprehensive Income [Member]	Dec. 31, 2011 Comprehensive Income [Member]	Dec. 31, 2010 Comprehensive Income [Member]	Dec. 31, 2012 Tax Benefit (Expense) [Member]	Dec. 31, 2011 Tax Benefit (Expense) [Member]	Dec. 31, 2010 Tax Benefit (Expense) [Member]	Dec. 31, 2012 Net Other Comprehensive Income (Loss) [Member]	Dec. 31, 2011 Net Other Comprehensive Income (Loss) [Member]	Dec. 31, 2010 Net Other Comprehensive Income (Loss) [Member]	Dec. 31, 2010 Cumulative-Effect Adjustment, Consolidation of Variable Interest Entity [Member]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax												$ 51,335,000	$ 49,935,000	$ 55,551,000	$ 46,102,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax												677,000	327,000	(133,000)	0
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax												(3,837,000)	6,307,000	(11,912,000)	(8,940,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	655,853,000								655,853,000			655,853,000	533,302,000	409,728,000	451,577,000
Accumulated Other Comprehensive Income (Loss), Investment in Retained Securitization Interests, Net of Tax														0	(3,483,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(607,678,000)				(476,733,000)				(607,678,000)	(476,733,000)		(607,678,000)	(476,733,000)	(366,222,000)	(417,898,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax																2,212,000	(6,251,000)	10,577,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax																556,000	731,000	(211,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax																(16,153,000)	28,864,000	(4,756,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax																194,649,000	196,274,000	(66,469,000)
Other Comprehensive Income (Loss), before Tax																(208,034,000)	(172,930,000)	72,079,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Tax Benefit (Expense)																			(206,000)	(271,000)	78,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Benefit (Expense)																			6,009,000	(10,645,000)	1,784,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax Benefit (Expense)																			(72,098,000)	(72,700,000)	24,620,000
Net income (loss)	70,600	134,000	247,300	172,000	105,600	183,600	190,600	119,300	623,925,000	599,114,000	146,545,000
Foreign currency translation adjustment																						1,400,000	(5,616,000)	9,449,000	0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Benefit (Expense)																			(812,000)	635,000	(1,128,000)
Unrealized gains (losses) on marketable securities									350,000	460,000	(133,000)											350,000	460,000	(133,000)	0
Investment in retained securitization interest																		0			0			0	3,483,000
Less: net losses reclassified into net income									9,631,000	(19,185,000)	(4,880,000)
Derivative financial instruments																						(10,144,000)	18,219,000	(2,972,000)	0
Less: net losses reclassified into net income									0	0	0
Amortization of net prior service cost									563,000	564,000	(925,000)
Amortization of actuarial loss									32,295,000	23,584,000	20,944,000
Less: actuarial loss reclassified into net income due to settlement									3,930,000	173,000	2,942,000
Less: net prior service credit (cost) reclassified into net income (loss) due to curtailment									0	1,000	(1,393,000)
Pension and postretirement healthcare plans																						(122,551,000)	(123,574,000)	41,849,000	0
Comprehensive income									492,980,000	488,603,000	194,738,000											(130,945,000)	(110,511,000)	48,193,000	3,483,000
Other Comprehensive Income (Loss), Tax																			$ 77,089,000	$ 62,419,000	$ (23,886,000)