Pension, Retiree Medical and Savings Plans (Estimated Future Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
2014	$ 565
2015	595
2016	640
2017	695
2018	750
2019-23	4,655
Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
2014	130	[1]
2015	130	[1]
2016	130	[1]
2017	135	[1]
2018	135	[1]
2019-23	655	[1]
Years 2014 Through 2018
Defined Benefit Plan Disclosure [Line Items]
Subsidies expected to be received under the 2003 Medicare Act	15
Years 2019 Through 2023
Defined Benefit Plan Disclosure [Line Items]
Subsidies expected to be received under the 2003 Medicare Act	$ 85

[1] Expected future benefit payments for our retiree medical plans do not reflect any estimated subsidies expected to be received under the 2003 Medicare Act. Subsidies are expected to be approximately $15 million for each of the years from 2014 through 2018 and approximately $85 million in total for 2019 through 2023.