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Fair Value Measurements - Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Apr. 01, 2016	Jan. 01, 2016	Apr. 03, 2015	Apr. 01, 2016	Apr. 03, 2015	Jul. 03, 2015
Liabilities
Goodwill	$ 5,940			$ 5,940		$ 6,348
Impairment of goodwill and other assets	0	$ 367	$ 0	367	$ 0
Harris CapRock Communications
Liabilities
Impairment of goodwill and other assets		$ 367
Recurring \| Deferred Compensation Plan Corporate Owned Life Insurance
Assets
Corporate-owned life insurance	17			17
Recurring \| Deferred Compensation Plan Corporate Owned Life Insurance \| Level 1
Assets
Corporate-owned life insurance	0			0
Recurring \| Deferred Compensation Plan Corporate Owned Life Insurance \| Level 2
Assets
Corporate-owned life insurance	17			17
Recurring \| Deferred Compensation Plan Corporate Owned Life Insurance \| Level 3
Assets
Corporate-owned life insurance	0			0
Recurring \| Deferred Compensation Plan Stock Fund
Assets
Stuck fund and equity security	56			56
Recurring \| Deferred Compensation Plan Stock Fund \| Level 1
Assets
Stuck fund and equity security	56			56
Recurring \| Deferred Compensation Plan Stock Fund \| Level 2
Assets
Stuck fund and equity security	0			0
Recurring \| Deferred Compensation Plan Stock Fund \| Level 3
Assets
Stuck fund and equity security	0			0
Recurring \| Equity Securities
Assets
Stuck fund and equity security	36			36
Recurring \| Equity Securities \| Level 1
Assets
Stuck fund and equity security	36			36
Recurring \| Equity Securities \| Level 2
Assets
Stuck fund and equity security	0			0
Recurring \| Equity Securities \| Level 3
Assets
Stuck fund and equity security	0			0
Recurring \| Fixed income securities
Assets
Fixed income securities	19			19
Recurring \| Fixed income securities \| Level 1
Assets
Fixed income securities	19			19
Recurring \| Fixed income securities \| Level 2
Assets
Fixed income securities	0			0
Recurring \| Fixed income securities \| Level 3
Assets
Fixed income securities	0			0
Recurring \| Deferred Compensation Plan
Liabilities
Deferred compensation plans	113			113
Recurring \| Deferred Compensation Plan \| Level 1
Liabilities
Deferred compensation plans	42			42
Recurring \| Deferred Compensation Plan \| Level 2
Liabilities
Deferred compensation plans	71			71
Recurring \| Deferred Compensation Plan \| Level 3
Liabilities
Deferred compensation plans	0			0
Critical Networks
Liabilities
Goodwill	2,055			2,055		$ 2,424
Critical Networks \| Harris CapRock Communications
Liabilities
Impairment of goodwill and other assets				367
Critical Networks \| Nonrecurring \| Harris CapRock Communications
Liabilities
Goodwill, gross	714			714
Goodwill	$ 347			347
Impairment of goodwill and other assets				$ 367