Pensions and Other Post-Retirement Benefits - Summary of Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in projected benefit obligation
Benefit obligation at beginning of period	$ 1,862	$ 1,740
Service cost	17	19	$ 19
Interest cost	50	67	62
Plan participants’ contributions	2	2
Actuarial (gains) losses	(88)	320
Benefits paid	(62)	(69)
Expenses paid	(4)	(5)
Premiums paid	(1)	(1)
Amendments		(4)
Curtailments	(3)	(1)
Settlements	(52)	(41)
Effect of foreign currency translation	(132)	(165)
Benefit obligation at end of period	1,589	1,862	1,740
Change in plan assets
Fair value of plan assets at beginning of period	1,574	1,588
Actual return on plan assets	18	202
Employer contributions	25	35
Plan participants’ contributions	2	2
Benefits paid	(62)	(69)
Expenses paid	(4)	(5)
Premiums paid	(1)	(1)
Settlements	(52)	(41)
Acquisition		6
Effect of foreign currency translation	(116)	(143)
Fair value of plan assets at end of period	1,384	1,574	1,588
Funded status	(205)	(288)
Amounts recognized in the Consolidated Balance Sheets
Pension assets included in other non-current assets	22	35
Current liabilities	(3)	(3)
Accrued benefit liability included in other non-current liabilities	(224)	(320)
Net amount recognized	(205)	(288)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss/(gain)	(60)	156
Amortization of prior service costs	1
Settlement loss	(15)	(7)
Amortization of net loss	(23)	(12)	(17)
Total recognized in other comprehensive income/(loss)	(97)	137
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	366	463
The Netherlands
Change in projected benefit obligation
Benefit obligation at beginning of period	784	761
Service cost	4	4	4
Interest cost	14	25	25
Plan participants’ contributions	1
Actuarial (gains) losses	(53)	137
Benefits paid	(29)	(35)
Expenses paid	(2)	(2)
Amendments		(4)
Effect of foreign currency translation	(80)	(102)
Benefit obligation at end of period	639	784	761
Change in plan assets
Fair value of plan assets at beginning of period	711	736
Actual return on plan assets	9	90
Employer contributions	5	11
Plan participants’ contributions	1
Benefits paid	(29)	(35)
Expenses paid	(2)	(2)
Acquisition		6
Effect of foreign currency translation	(73)	(95)
Fair value of plan assets at end of period	622	711	736
Funded status	(17)	(73)
Amounts recognized in the Consolidated Balance Sheets
Accrued benefit liability included in other non-current liabilities	(17)	(73)
Net amount recognized	(17)	(73)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss/(gain)	(54)	45
Amortization of net loss	(8)	(5)	(6)
Total recognized in other comprehensive income/(loss)	(62)	40
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	161	223
United States
Change in projected benefit obligation
Benefit obligation at beginning of period	380	336
Service cost		1
Interest cost	16	16	13
Actuarial (gains) losses	(4)	52
Benefits paid	(12)	(12)
Curtailments		(1)
Settlements	(46)	(12)
Benefit obligation at end of period	334	380	336
Change in plan assets
Fair value of plan assets at beginning of period	301	298
Actual return on plan assets	(13)	26
Employer contributions	1	1
Benefits paid	(12)	(12)
Settlements	(46)	(12)
Fair value of plan assets at end of period	231	301	298
Funded status	(103)	(79)
Amounts recognized in the Consolidated Balance Sheets
Current liabilities	(1)	(1)
Accrued benefit liability included in other non-current liabilities	(102)	(78)
Net amount recognized	(103)	(79)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss/(gain)	30	46
Settlement loss	(14)	(1)
Amortization of net loss	(7)	(4)	(5)
Total recognized in other comprehensive income/(loss)	9	41
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	105	96
Other
Change in projected benefit obligation
Benefit obligation at beginning of period	698	643
Service cost	13	14	15
Interest cost	20	26	24
Plan participants’ contributions	1	2
Actuarial (gains) losses	(31)	131
Benefits paid	(21)	(22)
Expenses paid	(2)	(3)
Premiums paid	(1)	(1)
Curtailments	(3)
Settlements	(6)	(29)
Effect of foreign currency translation	(52)	(63)
Benefit obligation at end of period	616	698	643
Change in plan assets
Fair value of plan assets at beginning of period	562	554
Actual return on plan assets	22	86
Employer contributions	19	23
Plan participants’ contributions	1	2
Benefits paid	(21)	(22)
Expenses paid	(2)	(3)
Premiums paid	(1)	(1)
Settlements	(6)	(29)
Effect of foreign currency translation	(43)	(48)
Fair value of plan assets at end of period	531	562	554
Funded status	(85)	(136)
Amounts recognized in the Consolidated Balance Sheets
Pension assets included in other non-current assets	22	35
Current liabilities	(2)	(2)
Accrued benefit liability included in other non-current liabilities	(105)	(169)
Net amount recognized	(85)	(136)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss/(gain)	(36)	65
Amortization of prior service costs	1
Settlement loss	(1)	(6)
Amortization of net loss	(8)	(3)	$ (6)
Total recognized in other comprehensive income/(loss)	(44)	56
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	$ 100	$ 144