Fair Value Measurements (Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2013	Dec. 28, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 2,500	$ 2,294
Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment Committee equity target allocation percentage of pension assets	60.00%
Pension plan assets at fair value	1,619	1,408
Information technology [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	173	169
Consumer discretionary [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	152	125
Health care [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	126	96
Financials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	116	83
Industrials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	108	78
Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	59	58
Consumer staples [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	43	55
Materials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	29	25
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	31	33
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment Committee equity target allocation percentage of pension assets	40.00%
Pension plan assets at fair value	795	829
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	17	17
Corporate securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	568	606
Common trust funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	553	426
Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	314	296
Government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	186	178
Asset-backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	24	28
Cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	20
Derivatives and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1	1
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	854	739
Level 1 [Member] | Information technology [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	173	169
Level 1 [Member] | Consumer discretionary [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	152	125
Level 1 [Member] | Health care [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	126	96
Level 1 [Member] | Financials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	116	83
Level 1 [Member] | Industrials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	108	78
Level 1 [Member] | Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	59	58
Level 1 [Member] | Consumer staples [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	43	55
Level 1 [Member] | Materials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	29	25
Level 1 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	31	33
Level 1 [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	17	17
Level 1 [Member] | Corporate securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Common trust funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Asset-backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 [Member] | Derivatives and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,646	1,555
Level 2 [Member] | Information technology [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Consumer discretionary [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Health care [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Financials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Industrials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Consumer staples [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Materials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 [Member] | Corporate securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	568	606
Level 2 [Member] | Common trust funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	553	426
Level 2 [Member] | Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	314	296
Level 2 [Member] | Government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	186	178
Level 2 [Member] | Asset-backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	24	28
Level 2 [Member] | Cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	20
Level 2 [Member] | Derivatives and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1	1
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Information technology [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Consumer discretionary [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Health care [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Financials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Industrials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Consumer staples [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Materials [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Corporate securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Common trust funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Asset-backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 [Member] | Derivatives and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 0	$ 0