Pension, Retiree Medical and Savings Plans (Selected Financial Information for Pension and Retiree Medical Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Components of the (decrease)/increase in net loss/(gain) included in accumulated other comprehensive loss
Amortization and settlement of losses	$ 355
Pension Plans, Defined Benefit
Change in fair value of plan assets
Employer contributions/funding	200	1,614	239
United States Pension Plan of US Entity, Defined Benefit
Change in projected benefit liability
Liability at beginning of year	12,886	11,901
Service cost	467	407	350
Interest cost	527	534	547
Plan amendments	22	15
Participant contributions
Experience (gain)/loss	(1,522)	932
Benefit payments	(533)	(278)
Settlement/curtailment	(44)	(633)
Special termination benefits	22	8
Foreign currency adjustment
Defined Benefit Plan, Other Changes
Liability at end of year	11,825	12,886	11,901
Change in fair value of plan assets
Fair value at beginning of year	10,817	9,072
Actual return on plan assets	1,159	1,282
Employer contributions/funding	63	1,368
Benefit payments	(533)	(278)
Defined Benefit Plan, Settlements, Plan Assets	(44)	(627)
Foreign currency adjustment
Fair value at end of year	11,462	10,817	9,072
Funded status	(363)	(2,069)
Amounts recognized
Other assets	603
Other current liabilities	(41)	(51)
Other liabilities	(925)	(2,018)
Net amount recognized	(363)	(2,069)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	2,069	4,212
Prior service cost/(credit)	125	121
Total	2,194	4,333
Components of the (decrease)/increase in net loss/(gain) included in accumulated other comprehensive loss
Change in discount rate	(1,532)	776
Employee-related assumption changes	24	135
Liability-related experience different from assumptions	(14)	66
Actual asset return different from expected return	(336)	(486)
Amortization and settlement of losses	(285)	(451)
Other, including foreign currency adjustments		(45)
Total	(2,143)	(5)
Liability at end of year for service to date	10,803	11,643
International
Change in projected benefit liability
Liability at beginning of year	2,788	2,381
Service cost	111	100	95
Interest cost	118	115	117
Plan amendments	(1)
Participant contributions	3	3
Experience (gain)/loss	(65)	200
Benefit payments	(91)	(76)
Settlement/curtailment	(3)	(40)
Special termination benefits		1
Foreign currency adjustment	(2)	102
Defined Benefit Plan, Other Changes	1	2
Liability at end of year	2,859	2,788	2,381
Change in fair value of plan assets
Fair value at beginning of year	2,463	2,031
Actual return on plan assets	265	206
Employer contributions/funding	137	246
Benefit payments	(91)	(76)
Defined Benefit Plan, Settlements, Plan Assets	(8)	(33)
Foreign currency adjustment	8	86
Fair value at end of year	2,777	2,463	2,031
Funded status	(82)	(325)
Amounts recognized
Other assets	74	51
Other current liabilities	(1)	(2)
Other liabilities	(155)	(374)
Net amount recognized	(82)	(325)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	849	1,096
Prior service cost/(credit)	(6)	(3)
Total	843	1,093
Components of the (decrease)/increase in net loss/(gain) included in accumulated other comprehensive loss
Change in discount rate	(166)	188
Employee-related assumption changes	91	(2)
Liability-related experience different from assumptions	10	14
Actual asset return different from expected return	(108)	(60)
Amortization and settlement of losses	(68)	(64)
Other, including foreign currency adjustments	(6)	43
Total	(247)	119
Liability at end of year for service to date	2,369	2,323
Retiree Medical Plan
Change in projected benefit liability
Liability at beginning of year	1,511	1,563
Service cost	45	50	51
Interest cost	54	65	88
Plan amendments
Participant contributions
Experience (gain)/loss	(128)	(63)
Benefit payments	(97)	(111)
Settlement/curtailment
Special termination benefits	2	5
Foreign currency adjustment	(3)	2
Defined Benefit Plan, Other Changes
Liability at end of year	1,384	1,511	1,563
Change in fair value of plan assets
Fair value at beginning of year	365	190
Actual return on plan assets	76	35
Employer contributions/funding	62	251
Benefit payments	(97)	(111)
Defined Benefit Plan, Settlements, Plan Assets
Foreign currency adjustment
Fair value at end of year	406	365	190
Funded status	(978)	(1,146)
Amounts recognized
Other assets
Other current liabilities	(72)	(71)
Other liabilities	(906)	(1,075)
Net amount recognized	(978)	(1,146)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	(222)	(44)
Prior service cost/(credit)	(69)	(92)
Total	(291)	(136)
Components of the (decrease)/increase in net loss/(gain) included in accumulated other comprehensive loss
Change in discount rate	(117)	84
Employee-related assumption changes	2	(67)
Liability-related experience different from assumptions	(13)	(80)
Actual asset return different from expected return	(49)	(13)
Amortization and settlement of losses	(1)
Other, including foreign currency adjustments
Total	$ (178)	$ (76)