Pension Benefits (Level 3 Gains and Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	$ 4,374	$ 3,931
Purchases	0	23
Fair value end of year	5,014	4,374
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Gain included in net change in Level 3 assets	8	8
Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	124	112
Purchases	3	1
Sales	(1)	(1)
Realized and unrealized gain (loss)	8	8
Transfer out		4
Currency translation	0
Fair value end of year	134	124
Bonds, Corporate [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	371	441
Bonds, Corporate [Member] | Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	0	1
Purchases	1	0
Sales	0	(1)
Realized and unrealized gain (loss)	0	0
Transfer out		0
Currency translation	0
Fair value end of year	1	0
Bonds, Other [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	52	66
Bonds, Other [Member] | Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	0	0
Real Estate [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	125	115
Real Estate [Member] | Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	115	105
Purchases	1	0
Sales	0	0
Realized and unrealized gain (loss)	8	6
Transfer out		4
Currency translation	1
Fair value end of year	125	115
Other [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	90	20
Other [Member] | Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	9	6
Purchases	1	1
Sales	(1)	0
Realized and unrealized gain (loss)	0	2
Transfer out		0
Currency translation	(1)
Fair value end of year	$ 8	$ 9