Commitments and Contingencies (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Oct. 08, 2015	Sep. 25, 2015	Dec. 26, 2014	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Lease payment obligations
Facility, land, vehicle, and equipment lease rental expense				$ 141	$ 130	$ 133
Fiscal 2016		$ 98		98
Fiscal 2017		76		76
Fiscal 2018		59		59
Fiscal 2019		44		44
Fiscal 2020		30		30
Thereafter		37		37
Non-cancelable lease obligations, total		344		$ 344
Loss Contingencies
Liabilities sharing percent, entity				31.00%
Liabilities sharing percent, Tyco International				27.00%
Liabilities sharing percent, Covidien				42.00%
Income tax benefit associated with settlement of certain U.S. tax matters		63	$ 189	$ 264		331
Other nonoperating expense, settlement of certain U.S. tax matters			$ 83	84		231
Net cash payments made as a result of the settlement of certain tax matters				40	179	28
Liabilities related to the audits of Tyco International and our income tax returns		17		17	$ 51
Com-Net
Loss Contingencies
Loss contingency, range of possible loss, maximum		80		80
Loss Contingency, purchase price plus interest and costs	$ 127
Loss Contingency Accrual, Provision				127
Audits of tax matters for the years 1997 through 2000
Loss Contingencies
Income tax benefit associated with settlement of certain U.S. tax matters						331
Other nonoperating expense, settlement of certain U.S. tax matters						$ 231
Disallowance related to interest deductions on Tyco International's U.S. income tax returns for intercompany loans originating during the period 1997 through 2000		2,700		2,700
Additional disallowance related to interest deductions on Tyco International's U.S. income tax returns for intercompany loans subsequent to fiscal 2000		6,600		6,600
Increase in taxable income in connection with the audit of Tyco International's fiscal years 1997 through 2000 relating to the disallowed interest deduction on certain intercompany loans		2,900		2,900
Additional tax in connection with the audit of Tyco International's fiscal years 1997 through 2000 relating to the disallowed interest deduction on certain intercompany loans		778		778
Additional penalties in connection with the audit of Tyco International's fiscal years 1997 through 2000 relating to the disallowed interest deduction on certain intercompany loans		154		154
Additional withholding taxes in connection with the audit of Tyco International's fiscal years 1997 through 2000 relating to the disallowed interest deduction on certain intercompany loans		105		105
Additional tax deficiency relating to the Final Partnership Administrative Adjustments		30		30
Audits of tax matters for the years 2001 through 2007
Loss Contingencies
Income tax benefit associated with settlement of certain U.S. tax matters				201
Other nonoperating expense, settlement of certain U.S. tax matters				84
Audits of tax matters for the years 2008 through 2010
Loss Contingencies
Income tax benefit associated with settlement of certain U.S. tax matters				63
Environmental matters
Loss Contingencies
Loss contingency, range of possible loss, minimum		16		16
Loss contingency, range of possible loss, maximum		38		38
Loss contingency, estimate of probable loss		$ 19		$ 19