Retirement Plans - Non U.S. and U.S. Pension Plans (Details) - USD ($) $ in Millions	Sep. 27, 2019	Sep. 28, 2018
Non-U.S. Plans
Defined Benefit Plan Disclosure
Accumulated benefit obligation	$ 2,340	$ 2,099
Pension plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	1,304	1,400
Fair value of plan assets	316	580
Pension plans with projected benefit obligations in excess of plan assets:
Projected benefit obligation	1,453	1,560
Fair value of plan assets	331	623
U.S. Plans
Defined Benefit Plan Disclosure
Accumulated benefit obligation	1,195	1,093
Pension plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	1,195	1,093
Fair value of plan assets	937	917
Pension plans with projected benefit obligations in excess of plan assets:
Projected benefit obligation	1,195	1,093
Fair value of plan assets	$ 937	$ 917