Pensions and Other Post-Retirement Benefits - Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Service cost	$ 17	$ 19	$ 19
Interest cost	50	67	62
Expected return on plan assets	(82)	(91)	(83)
Settlement loss recognized	15	7
Amortization of prior service costs	(1)
Amortization of net loss	23	12	17
Net periodic pension cost	22	14	15
The Netherlands
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Service cost	4	4	4
Interest cost	14	25	25
Expected return on plan assets	(30)	(35)	(34)
Amortization of net loss	8	5	6
Net periodic pension cost	(4)	(1)	1
United States
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Service cost		1
Interest cost	16	16	13
Expected return on plan assets	(21)	(21)	(18)
Settlement loss recognized	14	1
Amortization of net loss	7	4	5
Net periodic pension cost	16	1
Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Service cost	13	14	15
Interest cost	20	26	24
Expected return on plan assets	(31)	(35)	(31)
Settlement loss recognized	1	6
Amortization of prior service costs	(1)
Amortization of net loss	8	3	6
Net periodic pension cost	$ 10	$ 14	$ 14