Employee Benefit and Retirement Plans - Composition of International Pension Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 627	$ 580
International | Equity securities and funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	6	5
International | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	265	301
International | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	356	274
Level 1 | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	269	309
Level 1 | International | Equity securities and funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3	3
Level 1 | International | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	262	298
Level 1 | International | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	4	8
Level 2 | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	240	255
Level 2 | International | Equity securities and funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3	0
Level 2 | International | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3	0
Level 2 | International | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	234	255
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	10	9	$ 10
Level 3 | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	9	8
Level 3 | International | Equity securities and funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	0
Level 3 | International | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	0
Level 3 | International | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	9	8
Subtotal | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	518	572
Subtotal | International | Equity securities and funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	6	3
Subtotal | International | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	265	298
Subtotal | International | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	247	271
NAV-based assets | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	109	8
NAV-based assets | International | Equity securities and funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	2
NAV-based assets | International | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	3
NAV-based assets | International | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 109	$ 3