Components of Net Periodic Benefit Cost for Pension and Retiree Medical Plans (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 25, 2017	Mar. 19, 2016	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Average Remaining Service Period of Active Plan Participants, Pension Expense	11
Defined Benefit Plan, Contributions by Employer		$ 7
Defined Benefit Plan, Average remaining life expectancy of Inactive Plan Participants, Pension Expense	27
Cost Savings Related to Reorganization of U.S. Pension Plans	$ 10
Cost Savings Related to Reorganization of U.S. Pension Plans Net of Tax	6
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	93	91
Interest cost	108	111
Expected return on plan assets	(196)	(192)
Amortization of net losses/(gains)	28	38
Gross total	33	48
Defined Benefit Plan, Special Termination Benefits	(1)
Total expense	34	48
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	16	15
Interest cost	15	18
Expected return on plan assets	(30)	(31)
Amortization of net losses/(gains)	9	8
Gross total	10	10
Total expense	10	10
Retiree Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7
Interest cost	9	9
Expected return on plan assets	(5)	(5)
Amortization of prior service credits	(6)	(9)
Amortization of net losses/(gains)	(3)
Gross total	1	2
Total expense	$ 1	$ 2
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost Savings Related to Reorganization of U.S. Pension Plans			$ 40