Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1	$ 1
Interest cost	35	49	46
Expected return on plan assets	(59)	(59)	(67)
Prior service cost	0	0	0
Net actuarial loss	23	15	21
Curtailment, settlement and termination costs	52	0	0
Total expense	$ 51	$ 6	$ 1
Effective discount rate for benefit obligations	3.06%	4.12%	3.48%
Effective rate for interest on benefit obligations	2.65%	3.79%	3.09%
Effective rate for service cost	3.43%	3.93%	3.32%
Effective rate for interest on service cost	3.41%	3.62%	2.98%
Long-term rate of return on plan assets	5.50%	5.25%	5.75%
Long-term rate of compensation increase	3.00%	3.00%	2.54%
Pension Benefits | International
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 6	$ 6
Interest cost	9	13	13
Expected return on plan assets	(6)	(13)	(15)
Prior service cost	1	0	1
Net actuarial loss	3	2	2
Curtailment, settlement and termination costs	1	1	1
Total expense	$ 12	$ 9	$ 8
Effective discount rate for benefit obligations	1.79%	2.52%	2.24%
Effective rate for interest on benefit obligations	1.55%	2.20%	1.94%
Effective rate for service cost	0.92%	1.89%	2.33%
Effective rate for interest on service cost	0.75%	2.24%	2.27%
Long-term rate of return on plan assets	1.08%	2.47%	2.58%
Long-term rate of compensation increase	2.32%	2.32%	3.47%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	1	2	$ 2
Prior service cost	(2)	(5)	(7)
Net actuarial loss	(4)	(4)	(3)
Total expense	$ (5)	$ (7)	$ (8)
Effective discount rate for benefit obligations	2.80%	3.90%	3.09%
Effective rate for interest on benefit obligations	2.41%	2.71%	2.71%
Effective rate for service cost	2.52%	2.97%	2.98%
Effective rate for interest on service cost	2.27%	2.78%	2.78%