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Significant Accounting Policies and Recent Accounting Standards - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Jun. 29, 2018	Jun. 30, 2017	Jul. 02, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Revenue recognized from performance obligations satisfied in prior periods	$ 7	$ 14
Contract costs payment period	1 year
Revenue performance obligation contract period	greater than one year
Increase in costs and services sold	$ 1,010	919
Increase in engineering, selling and administrative expenses	279	268
Increase in non-operating income	47	46
Effect of Adopting ASU 2014-09
Business Combination, Separately Recognized Transactions [Line Items]
Operating income (loss)			$ (19)	$ (10)
Operating income (loss), per diluted share (in dollars per share)			$ (0.15)	$ (0.08)
Decrease in revenue from product sales and services			$ 14	$ 3
Effect of Adopting ASU 2017-07
Business Combination, Separately Recognized Transactions [Line Items]
Increase in costs and services sold		37
Increase in engineering, selling and administrative expenses		9
Increase in non-operating income		46
Retained Earnings | Effect of Adopting ASU 2014-09
Business Combination, Separately Recognized Transactions [Line Items]
Cumulative effect adjustment as reduction of opening balance of retained earnings					$ 15
Contracts Accounted for under Percentage of Completion
Business Combination, Separately Recognized Transactions [Line Items]
Operating income (loss)	(3)	5
Operating income (loss), after-tax	$ (2)	$ 3
Operating income (loss), per diluted share (in dollars per share)	$ (0.02)	$ 0.02

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