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Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Amount of correction	$ 17		$ 17
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	0	$ 0	1	$ 1
Interest cost on projected benefit obligation	62	4	68	12
Expected return on plan assets	(92)	(7)	(102)	(21)
Net amortization and deferrals	23	2	27	6
Net periodic benefit (income) cost	(7)	(1)	(6)	(2)
Pension Plans | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	10	6	32	18
Interest cost on projected benefit obligation	3	3	8	9
Expected return on plan assets	(19)	(12)	(44)	(35)
Net amortization and deferrals	5	4	15	12
Net periodic benefit (income) cost	$ (1)	$ 1	$ 11	$ 4

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