Financial Instruments - Derivative Instruments at Gross Fair Value (Details) - Level 2 - USD ($) $ in Millions	Apr. 01, 2017	Sep. 24, 2016
Other current assets | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	$ 963	$ 671
Other current assets | Interest rate contracts
Derivative assets:
Fair value of derivative assets	161	728
Other current assets | Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	691	518
Other current assets | Derivatives designated as accounting hedges | Interest rate contracts
Derivative assets:
Fair value of derivative assets	161	728
Other current assets | Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	272	153
Other current assets | Derivatives not designated as accounting hedges | Interest rate contracts
Derivative assets:
Fair value of derivative assets	0	0
Accrued expenses | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	1,077	1,069
Accrued expenses | Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	354	7
Accrued expenses | Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	832	935
Accrued expenses | Derivatives designated as accounting hedges | Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	354	7
Accrued expenses | Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	245	134
Accrued expenses | Derivatives not designated as accounting hedges | Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	$ 0	$ 0