Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions		6 Months Ended
		Dec. 31, 2020	Jun. 28, 2020
Pension Plan [Member] | U.S. [Member] | Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions from our general assets for the six months ended June 28, 2020			$ 3
Expected contributions from our general assets during 2020	[1]		1,253
Pension Plan [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions from our general assets for the six months ended June 28, 2020			116
Expected contributions from our general assets during 2020	[1]		185
Supplemental Employee Retirement Plan [Member] | U.S. [Member] | Non-Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions from our general assets for the six months ended June 28, 2020			150
Expected contributions from our general assets during 2020	[1]		183
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions from our general assets for the six months ended June 28, 2020			64
Expected contributions from our general assets during 2020	[1]		$ 137
Subsequent Event [Member] | Forecast [Member] | Pension Plan [Member] | U.S. [Member] | Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions from our general assets for the six months ended June 28, 2020		$ 1,250

[1] Contributions expected to be made for 2020 are inclusive of amounts contributed during the six months ended June 28, 2020. The U.S. supplemental (non-qualified) pension plan, international pension plan and the postretirement plan contributions from our general assets include direct employer benefit payments. For the U.S. qualified plans, we plan to make a $1.25 billion voluntary contribution in the second half of 2020.