Income Taxes - Tax Loss and Credit Carryforwards (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 25, 2015
Tax loss and credit carryforward
Total tax loss and credit carryforwards	$ 4,656	$ 4,856
U.S. Federal
Tax loss and credit carryforward
Net operating loss carryforwards	1,404
Tax credit carryforwards	209
Capital loss carryforwards	36
U.S. State
Tax loss and credit carryforward
Net operating loss carryforwards	108
Tax credit carryforwards	34
Non-U.S.
Tax loss and credit carryforward
Net operating loss carryforwards	2,830
Tax credit carryforwards	1
Capital loss carryforwards	34
Through 2021
Tax loss and credit carryforward
Total tax loss and credit carryforwards	135
Through 2021 | U.S. Federal
Tax loss and credit carryforward
Tax credit carryforwards	15
Capital loss carryforwards	36
Through 2021 | U.S. State
Tax loss and credit carryforward
Net operating loss carryforwards	53
Tax credit carryforwards	12
Through 2021 | Non-U.S.
Tax loss and credit carryforward
Net operating loss carryforwards	12
Capital loss carryforwards	7
2022 Through 2036
Tax loss and credit carryforward
Total tax loss and credit carryforwards	1,604
2022 Through 2036 | U.S. Federal
Tax loss and credit carryforward
Net operating loss carryforwards	1,404
Tax credit carryforwards	124
2022 Through 2036 | U.S. State
Tax loss and credit carryforward
Net operating loss carryforwards	55
Tax credit carryforwards	15
2022 Through 2036 | Non-U.S.
Tax loss and credit carryforward
Net operating loss carryforwards	5
Tax credit carryforwards	1
No Expiration
Tax loss and credit carryforward
Total tax loss and credit carryforwards	2,917
No Expiration | U.S. Federal
Tax loss and credit carryforward
Tax credit carryforwards	70
No Expiration | U.S. State
Tax loss and credit carryforward
Tax credit carryforwards	7
No Expiration | Non-U.S.
Tax loss and credit carryforward
Net operating loss carryforwards	2,813
Capital loss carryforwards	$ 27