Pension Benefits - Changes in Benefit Obligation and Plan Assets (Details) (USD $)	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Change in benefit obligation
Lump-sum settlement paid	$ (9,500,000)
Amount recognized in accumulated other comprehensive loss
Accumulated benefit obligation	2,360,000,000	2,030,000,000
Qualified Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	1,778,647,000	1,965,406,000
Service cost	9,543,000	11,225,000	11,903,000
Interest cost	84,447,000	77,136,000	94,113,000
Plan participants’ contributions	26,000	26,000
Actuarial loss/(gain)	330,224,000	(161,348,000)
Lump-sum settlement paid	0	0
Benefits paid	(101,314,000)	(113,798,000)
Effects of change in currency conversion	0	0
Benefit obligation at end of year	2,101,573,000	1,778,647,000	1,965,406,000
Change in plan assets
Fair value of plan assets at beginning of year	1,698,091,000	1,615,723,000
Actual return on plan assets	225,470,000	122,030,000
Employer contributions	14,977,000	74,110,000
Lump-sum settlement paid	0	0
Effect of change in currency conversion	0	0
Fair value of plan assets at end of year	1,837,250,000	1,698,091,000	1,615,723,000
Amount recognized in the Consolidated Balance Sheets
Current liabilities	0	0
Noncurrent liabilities	(264,323,000)	(80,556,000)
Net amount recognized	(264,323,000)	(80,556,000)
Amount recognized in accumulated other comprehensive loss
Actuarial loss	854,267,000	662,293,000
Prior service credit	(26,565,000)	(28,510,000)
Total amount recognized in accumulated other comprehensive loss	827,702,000	633,783,000
Non-Qualified Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	262,501,000	299,265,000
Service cost	184,000	1,162,000	1,656,000
Interest cost	10,450,000	10,681,000	12,635,000
Plan participants’ contributions	0	0
Actuarial loss/(gain)	36,604,000	(18,960,000)
Lump-sum settlement paid	(24,015,000)	(10,667,000)
Benefits paid	(17,507,000)	(19,149,000)
Effects of change in currency conversion	(393,000)	169,000
Benefit obligation at end of year	267,824,000	262,501,000	299,265,000
Change in plan assets
Fair value of plan assets at beginning of year	0
Actual return on plan assets	0	0
Employer contributions	41,522,000	29,999,000
Lump-sum settlement paid	(24,015,000)	(10,667,000)
Effect of change in currency conversion	0	(183,000)
Fair value of plan assets at end of year	0	0
Amount recognized in the Consolidated Balance Sheets
Current liabilities	(15,767,000)	(17,903,000)
Noncurrent liabilities	(252,057,000)	(244,598,000)
Net amount recognized	(267,824,000)	(262,501,000)
Amount recognized in accumulated other comprehensive loss
Actuarial loss	119,797,000	97,436,000
Prior service credit	0	0
Total amount recognized in accumulated other comprehensive loss	119,797,000	97,436,000
Pension Plans, Defined Benefit [Member]
Change in benefit obligation
Benefit obligation at beginning of year	2,041,148,000	2,264,671,000
Service cost	9,727,000	12,387,000	13,559,000
Interest cost	94,897,000	87,817,000	106,748,000
Plan participants’ contributions	26,000	26,000
Actuarial loss/(gain)	366,828,000	(180,308,000)
Lump-sum settlement paid	(24,015,000)	(10,667,000)
Benefits paid	(118,821,000)	(132,947,000)
Effects of change in currency conversion	(393,000)	169,000
Benefit obligation at end of year	2,369,397,000	2,041,148,000	2,264,671,000
Change in plan assets
Fair value of plan assets at beginning of year	1,698,091,000	1,615,723,000
Actual return on plan assets	225,470,000	122,030,000
Employer contributions	56,499,000	104,109,000
Lump-sum settlement paid	(24,015,000)	(10,667,000)	(112,000,000)
Effect of change in currency conversion	0	(183,000)
Fair value of plan assets at end of year	1,837,250,000	1,698,091,000	1,615,723,000
Amount recognized in the Consolidated Balance Sheets
Current liabilities	(15,767,000)	(17,903,000)
Noncurrent liabilities	(516,380,000)	(325,154,000)
Net amount recognized	(532,147,000)	(343,057,000)
Amount recognized in accumulated other comprehensive loss
Actuarial loss	974,064,000	759,729,000
Prior service credit	(26,565,000)	(28,510,000)
Total amount recognized in accumulated other comprehensive loss	$ 947,499,000	$ 731,219,000