Defined Benefit Plan Assets Measured at Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Sep. 29, 2012		Oct. 01, 2011
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	$ 8,437		$ 6,853
Percentage of plan assets mix	100.00%		100.00%
Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	3,940		2,640
Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	3,173		2,984
Level 3
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	1,324		1,229
Equity investments | U S Small Cap
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	93		231
Percentage of plan assets mix	1.00%		3.00%
Equity investments | U S Small Cap | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	93		35
Equity investments | U S Small Cap | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements			196
Equity investments | U S Mid Cap
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	261		208
Percentage of plan assets mix	3.00%		3.00%
Equity investments | U S Mid Cap | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	261		208
Equity investments | U S Large Cap
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	1,485	[1]	974	[1]
Percentage of plan assets mix	18.00%		14.00%
Equity investments | U S Large Cap | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	1,485	[1]	707	[1]
Equity investments | U S Large Cap | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements			267	[1]
Equity investments | International
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	1,546		1,422
Percentage of plan assets mix	18.00%		21.00%
Equity investments | International | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	1,096		1,162
Equity investments | International | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	450		260
Fixed Income | Corporate bonds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	736		673
Percentage of plan assets mix	9.00%		10.00%
Fixed Income | Corporate bonds | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	736		673
Fixed Income | Government and federal agency bonds and notes
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	1,737		1,429
Percentage of plan assets mix	21.00%		21.00%
Fixed Income | Government and federal agency bonds and notes | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	827		440
Fixed Income | Government and federal agency bonds and notes | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	910		989
Fixed Income | Mortgage and asset-backed securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	212		243
Percentage of plan assets mix	3.00%		4.00%
Fixed Income | Mortgage and asset-backed securities | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements			2
Fixed Income | Mortgage and asset-backed securities | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	212		241
Alternative Investments | Diversified
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	544		532
Percentage of plan assets mix	6.00%		8.00%
Alternative Investments | Diversified | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	83		63
Alternative Investments | Diversified | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	282		298
Alternative Investments | Diversified | Level 3
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	179		171
Alternative Investments | Distressed
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	194		228
Percentage of plan assets mix	2.00%		3.00%
Alternative Investments | Distressed | Level 3
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	194		228
Alternative Investments | Private equity
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	545		492
Percentage of plan assets mix	6.00%		7.00%
Alternative Investments | Private equity | Level 3
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	545		492
Alternative Investments | Venture capital
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	78		75
Percentage of plan assets mix	1.00%		1.00%
Alternative Investments | Venture capital | Level 3
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	78		75
Alternative Investments | Real estate
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	328		263
Percentage of plan assets mix	4.00%		4.00%
Alternative Investments | Real estate | Level 3
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	328		263
Derivatives and other
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	11		10
Derivatives and other | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	11		10
Cash
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	667		73
Percentage of plan assets mix	8.00%		1.00%
Cash | Level 1
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	95		23
Cash | Level 2
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	$ 572		$ 50

[1] Large cap domestic equities include 2.8 million shares of Company common stock valued at $147 million (2% of total plan assets) and $85 million (1% of total plan assets) at 2012 and 2011, respectively