Pension Benefits (Level 3 Gains and Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	$ 3,931	$ 3,967
Purchases	23	0
Fair value end of year	4,374	3,931
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Gain included in net change in Level 3 assets	8	4
Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	112	66
Purchases	1	53
Sales	(1)	(11)
Realized and unrealized gain (loss)	8	4
Currency translation	4
Fair value end of year	124	112
Bonds, Corporate [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	441	299
Bonds, Corporate [Member] | Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	1	1
Purchases	0	1
Sales	(1)	(1)
Realized and unrealized gain (loss)	0	0
Currency translation	0
Fair value end of year	0	1
Bonds, Other [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	66	55
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	115	105
Real Estate [Member] | Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	105	58
Purchases	0	50
Sales	0	(7)
Realized and unrealized gain (loss)	6	4
Currency translation	4
Fair value end of year	115	105
Other [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value end of year	20	7
Other [Member] | Level 3 [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	6	7
Purchases	1	2
Sales	0	(3)
Realized and unrealized gain (loss)	2	0
Currency translation	0
Fair value end of year	$ 9	$ 6