Postretirement Health-Care and Life-Insurance Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Minimum age for eligibility for postretirement benefits	55
Postretirement benefits, requisite service period	10
Medicare Part D subsidy	$ 0	$ 1	$ 1
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	1
Amortization of net actuarial loss	4
Future plan benefit payments 2015	74
Future plan benefit payments 2016	78
Future plan benefit payments 2017	81
Future plan benefit payments 2018	84
Future plan benefit payments 2019	86
Future plan benefit payments from 2020 to 2024	473
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	5
Amortization of net actuarial loss	1
Postretirement Medical And Life Insurance
Defined Benefit Plan Disclosure [Line Items]
Future plan benefit payments 2015	6
Future plan benefit payments 2016	6
Future plan benefit payments 2017	6
Future plan benefit payments 2018	7
Future plan benefit payments 2019	7
Future plan benefit payments from 2020 to 2024	$ 35