Pensions and Other Post-Retirement Benefits - Summary of Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in projected benefit obligation
Benefit obligation at beginning of period	$ 1,598	$ 1,772
Service cost	7	9	$ 13
Interest cost	36	35	34
Plan participants’ contributions	1	1
Actuarial (gain)/loss	156	(86)
Benefits paid	(70)	(69)
Premiums paid		(1)
Settlements	(632)	(4)
Curtailments	(3)
Combinations		2
Amendments	1	1
Effect of foreign currency translation	2	(62)
Benefit obligation at end of period	1,096	1,598	1,772
Change in plan assets
Fair value of plan assets at beginning of period	1,396	1,559
Actual return on plan assets	176	(62)
Employer contributions	28	29
Plan participants’ contributions	1	1
Benefits paid	(70)	(69)
Premiums paid		1
Settlements	(632)	(4)
Combinations		2
Effect of foreign currency translation	2	(59)
Fair value of plan assets at end of period	901	1,396	1,559
Funded status	(195)	(202)
Premiums paid		(1)
Amounts recognized in the Consolidated Balance Sheets
Pension assets included in other non-current assets	26	17
Current liabilities	(2)	(2)
Accrued benefit liability included in other non-current liabilities	(219)	(217)
Net amount recognized	(195)	(202)
Amounts recognized in Other Comprehensive Income/(Loss), before tax
Net (gain)/loss	35	22
Settlement loss	(170)	(1)
Amortization of prior service cost		1	1
Curtailment gain recognized	1
Amortization of net loss	(13)	(19)	(18)
Total recognized in other comprehensive income/(loss)	(147)	3
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	286	433
Amortization of prior service cost		1	1
The Netherlands
Change in projected benefit obligation
Benefit obligation at beginning of period	647	724
Service cost	3	3	5
Interest cost	9	10	9
Actuarial (gain)/loss	42	(29)
Benefits paid	(29)	(30)
Settlements	(573)
Curtailments	(3)
Effect of foreign currency translation	(14)	(31)
Benefit obligation at end of period	82	647	724
Change in plan assets
Fair value of plan assets at beginning of period	637	718
Actual return on plan assets	50	(25)
Employer contributions	4	5
Benefits paid	(29)	(30)
Settlements	(573)
Effect of foreign currency translation	(14)	(31)
Fair value of plan assets at end of period	75	637	718
Funded status	(7)	(10)
Amounts recognized in the Consolidated Balance Sheets
Accrued benefit liability included in other non-current liabilities	(7)	(10)
Net amount recognized	(7)	(10)
Amounts recognized in Other Comprehensive Income/(Loss), before tax
Net (gain)/loss	5	11
Settlement loss	(164)
Curtailment gain recognized	1
Amortization of net loss	(5)	(6)	(7)
Total recognized in other comprehensive income/(loss)	(163)	5
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	27	190
Other
Change in projected benefit obligation
Benefit obligation at beginning of period	613	678
Service cost	4	6	8
Interest cost	13	13	13
Plan participants’ contributions	1	1
Actuarial (gain)/loss	71	(28)
Benefits paid	(24)	(24)
Premiums paid		(1)
Settlements	(59)	(4)
Combinations		2
Amendments	1	1
Effect of foreign currency translation	16	(31)
Benefit obligation at end of period	636	613	678
Change in plan assets
Fair value of plan assets at beginning of period	528	581
Actual return on plan assets	80	(14)
Employer contributions	14	15
Plan participants’ contributions	1	1
Benefits paid	(24)	(24)
Premiums paid		1
Settlements	(59)	(4)
Combinations		2
Effect of foreign currency translation	16	(28)
Fair value of plan assets at end of period	556	528	581
Funded status	(80)	(85)
Premiums paid		(1)
Amounts recognized in the Consolidated Balance Sheets
Pension assets included in other non-current assets	26	17
Current liabilities	(2)	(1)
Accrued benefit liability included in other non-current liabilities	(104)	(101)
Net amount recognized	(80)	(85)
Amounts recognized in Other Comprehensive Income/(Loss), before tax
Net (gain)/loss	15	1
Settlement loss	(6)	(1)
Amortization of prior service cost		1	1
Amortization of net loss	(2)	(4)	(5)
Total recognized in other comprehensive income/(loss)	7	(3)
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	136	129
Amortization of prior service cost		1	1
United States
Change in projected benefit obligation
Benefit obligation at beginning of period	338	370
Interest cost	14	12	12
Actuarial (gain)/loss	43	(29)
Benefits paid	(17)	(15)
Benefit obligation at end of period	378	338	370
Change in plan assets
Fair value of plan assets at beginning of period	231	260
Actual return on plan assets	46	(23)
Employer contributions	10	9
Benefits paid	(17)	(15)
Fair value of plan assets at end of period	270	231	260
Funded status	(108)	(107)
Amounts recognized in the Consolidated Balance Sheets
Current liabilities		(1)
Accrued benefit liability included in other non-current liabilities	(108)	(106)
Net amount recognized	(108)	(107)
Amounts recognized in Other Comprehensive Income/(Loss), before tax
Net (gain)/loss	15	10
Amortization of net loss	(6)	(9)	$ (6)
Total recognized in other comprehensive income/(loss)	9	1
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	$ 123	$ 114