Summary of Amount Recognised in Balance Sheets for Pension Plans and Postretirement Benefit Plan (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost		$ 6	$ 5	$ 6
Prior period correction	11
Employer contributions		46
Fair value at December 31	726	726
Actuarial loss		4	4	5
Prior service cost		(4)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	0	0	0
Noncurrent liabilities	(339)	(339)	(249)
United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		112
Interest cost		20	19	20
Benefits paid		(8)	(8)
Benefit obligation at December 31			112
Actuarial loss		7	9	7
Prior service cost		1	1
Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost		18	17	18
Actuarial loss		7	10	7
Prior service cost		5	7
Postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		112	131
Service cost			0
Interest cost		6	5
Actuarial (gain)/loss		18	(16)
Prior period correction		15
Benefits paid		(8)
Benefit obligation at December 31	143	143	112
Employer contributions		8	8
Prescription drug subsidy received			0
Unfunded status at December 31		(143)	(112)
Actuarial loss		53	32
Prior service cost		(10)	(16)
Net amount recognized at December 31	(100)	(100)	(96)
Current liabilities	(9)	(9)	(8)
Noncurrent liabilities	(134)	(134)	(104)
Net amount recognized	(143)	(143)	(112)
Pension Plans, Defined Benefit | United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		421	461
Settlement		(53)
Service cost		1	1
Interest cost		20	19
Actuarial (gain)/loss		77	(41)
Benefits paid		(18)	(19)
Benefit obligation at December 31	448	448	421
Fair value at December 31 of the previous year		347	275
Settlement		(41)
Actual return on plan assets		23	60
Employer contributions		23	31
Fair value at December 31	334	334	347
Unfunded status at December 31		(115)	(74)
Actuarial loss		230	190
Prior service cost		1	1
Net amount recognized at December 31	116	116	117
Current liabilities	(10)	(10)	(6)
Noncurrent liabilities	(105)	(105)	(68)
Net amount recognized	(115)	(115)	(74)
Pension Plans, Defined Benefit | Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		442	431
Currency rate conversion		(41)	(2)
Settlement		0	(1)
Curtailment		0	(1)
Service cost		8	9
Interest cost		18	17
Administrative expenses/taxes paid		(2)	(2)
Plan amendments		0	1
Actuarial (gain)/loss		73	6
Benefits paid		(17)	(18)
Participants' contributions		2	2
Benefit obligation at December 31	483	483	442
Fair value at December 31 of the previous year		379	332
Currency rate conversion		(32)	(3)
Settlement		0	(1)
Actual return on plan assets		40	43
Employer contributions		22	26
Participants' contributions		2	2
Fair value at December 31	392	392	379
Unfunded status at December 31		(90)	(62)
Actuarial loss		172	137
Prior service cost		5	7
Net amount recognized at December 31	87	87	82
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	8	8	11
Current liabilities	(3)	(3)	(2)
Noncurrent liabilities	(95)	(95)	(71)
Net amount recognized	$ (90)	$ (90)	$ (62)