Pensions and Other Employee Benefits - Changes in Benefit Obligations, Plan Assets and Funded Status and Aggregate Balance Sheet Impact (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets and (liabilities) recognized in the consolidated balance sheets consist of:
Non-current liabilities	$ (1,187)	$ (727)
Pension Plans [Member]
Change in benefit obligation:
Benefit obligation at the beginning of the year	2,973	3,222
Service cost	106	126	113
Interest cost	147	132	134
Plan participants' contributions	2	2
Amendments	1	14
Actuarial loss (gain)	579	(402)
Foreign currency exchange rate changes	(34)	(21)
Curtailments, settlements and special termination benefits	1	3
Benefits paid	(112)	(103)
Benefit obligation at the end of the year	3,663	2,973	3,222
Change in plan assets:
Fair value of plan assets at the beginning of the year	2,403	2,026
Actual return on plan assets	205	394
Employer contributions	97	105
Plan participants' contributions	2	2
Foreign currency exchange rate changes	(25)	(21)
Benefits paid	(112)	(103)
Fair value of plan assets at the end of the year	2,570	2,403	2,026
Unfunded status at the end of the year	(1,093)	(570)
Assets and (liabilities) recognized in the consolidated balance sheets consist of:
Non-current assets	26	35
Current liabilities	(4)	(8)
Non-current liabilities	(1,056)	(597)
Liabilities held for sale	(59)
Total	(1,093)	(570)
Postretirement Benefit Plans [Member]
Change in benefit obligation:
Benefit obligation at the beginning of the year	194	218
Service cost	3	4	4
Interest cost	8	7	10
Plan participants' contributions	4	4
Amendments	(1)
Actuarial loss (gain)	5	(23)
Foreign currency exchange rate changes	(2)	(3)
Curtailments, settlements and special termination benefits
Benefits paid	(12)	(13)
Benefit obligation at the end of the year	199	194	218
Change in plan assets:
Fair value of plan assets at the beginning of the year	55	47
Actual return on plan assets	6	9
Employer contributions	7	8
Plan participants' contributions	4	4
Foreign currency exchange rate changes
Benefits paid	(12)	(13)
Fair value of plan assets at the end of the year	60	55	47
Unfunded status at the end of the year	(139)	(139)
Assets and (liabilities) recognized in the consolidated balance sheets consist of:
Non-current assets
Current liabilities	(8)	(9)
Non-current liabilities	(131)	(130)
Liabilities held for sale
Total	$ (139)	$ (139)