Pension and Other Benefit Programs - Defined Benefit Plan Assets Measured at Fair Value (Detail) - USD ($) $ in Millions		Oct. 03, 2015	Sep. 27, 2014
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 9,983	$ 10,303
Percentage of plan assets mix		100.00%	100.00%
Cash & Money Market Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 1,092	$ 1,232
Percentage of plan assets mix		11.00%	12.00%
Common and Preferred Stocks
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	[1]	$ 2,883	$ 3,456
Percentage of plan assets mix		29.00%	34.00%
Mutual Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 691	$ 710
Percentage of plan assets mix		7.00%	7.00%
Common Collective Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 489	$ 439
Percentage of plan assets mix		5.00%	4.00%
US Government Debt Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 1,573	$ 1,609
Percentage of plan assets mix		16.00%	16.00%
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		$ 671	$ 694
Percentage of plan assets mix		7.00%	7.00%
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		$ 137	$ 162
Percentage of plan assets mix		1.00%	2.00%
Alternative Investments
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 2,232	$ 1,871
Percentage of plan assets mix		22.00%	18.00%
Derivatives and Other, Net
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 215	$ 130
Percentage of plan assets mix		2.00%	1.00%
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		$ 3,927	$ 4,570
Level 1 | Cash & Money Market Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		56	133
Level 1 | Common and Preferred Stocks
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	[1]	2,000	2,800
Level 1 | Mutual Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		476	415
Level 1 | Common Collective Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		13	18
Level 1 | US Government Debt Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		1,090	993
Level 1 | Alternative Investments
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		80	90
Level 1 | Derivatives and Other, Net
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		212	121
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		4,856	4,467
Level 2 | Cash & Money Market Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		1,036	1,099
Level 2 | Common and Preferred Stocks
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements	[1]	883	656
Level 2 | Mutual Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		215	295
Level 2 | Common Collective Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		476	421
Level 2 | US Government Debt Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		483	616
Level 2 | 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		671	694
Level 2 | 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		137	162
Level 2 | Alternative Investments
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		952	515
Level 2 | Derivatives and Other, Net
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		3	9
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		1,200	1,266
Level 3 | Alternative Investments
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value asset measurements		$ 1,200	$ 1,266

[1] Includes 2.8 million shares of Company common stock valued at $290 million (3% of total plan assets) and 2.9 million shares valued at $255 million (2% of total plan assets) at October 3, 2015 and September 27, 2014, respectively.