Pension Plans, Postretirement and Other Employee Benefits - Projected Benefit Obligation Accumulated Benefit Obligation and Fair Value of Plan Assets for All Pension Plans (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 1,302,000,000	$ 263,000,000
Accumulated benefit obligation	1,302,000,000	263,000,000
Fair value of plan assets	995,000,000	202,000,000
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	620,000,000	117,000,000
Accumulated benefit obligation	606,000,000	112,000,000
Fair value of plan assets	111,000,000	56,000,000
Pension Plans | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	1,302,000,000	263,000,000
Fair value of plan assets	995	202
Pension Plans | Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	652,000,000	130,000,000
Fair value of plan assets	138	69
Other Postretirement Benefits Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	322,000,000	151,000,000
Fair value of plan assets	$ 0	$ 0