Pension Plans, Postretirement and Other Employee Benefits - Changes in Fair Value of Level 3 Assets (Detail) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
U.S.
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at December 31 of the previous year	$ 28	$ 0
Net realized/unrealized gains (loss)	2	(2)
Purchases and settlements, net	8	0
Sales, net	(17)	0
Transfers into (out) of Level 3	0	0
Acquisitions	0	30
Held for sale	0	0
Foreign exchange	0	0
Ending Balance at December 31	21	28
Non-U.S.
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at December 31 of the previous year	71	9
Net realized/unrealized gains (loss)	7	1
Purchases and settlements, net	24	0
Sales, net	(20)	0
Transfers into (out) of Level 3	0	15
Acquisitions	0	56
Held for sale	0	(10)
Foreign exchange	(2)	0
Ending Balance at December 31	$ 80	$ 71