Employee Benefit Plans (Changes in Projected Benefit Obligations, Plan Assets and Funded Status) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefits paid		$ (61)
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	$ (130)	(94)
Accrued pensions	(712)	(995)
Other postretirement benefits	(1,021)	(1,132)
Pensions
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	5,775	5,240
Service cost	59	52
Interest cost	201	230
Actuarial (gains) / losses - net	(143)	846
Benefits paid	(271)	(390)
Plan transfers	0	36
Foreign currency translation adjustments	(237)	(229)
Curtailment and special termination benefits	(8)	(6)
Other	(27)	(4)
Projected benefit obligation, End of year	5,349	5,775
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	4,839	4,701
Actual return on plan assets	(19)	658
Company contributions	289	41
Participant contributions	2	2
Benefits paid	(249)	(375)
Plan transfers	0	35
Plan settlements	(17)	(4)
Plan expenses and other-net	4	4
Foreign currency translation adjustments	(214)	(198)
Impact of commodity chemicals transaction	0	(22)
Other	0	5
End balance	4,627	4,839
Funded Status	(722)	(936)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	57	86
Accounts payable and accrued liabilities	(67)	(27)
Accrued pensions	(712)	(995)
Other postretirement benefits	0	0
Net liability recognized	(722)	(936)
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	1,196	1,070
Service cost	17	15
Interest cost	45	47
Actuarial (gains) / losses - net	(104)	125
Benefits paid	(52)	(44)
Plan transfers	0	0
Foreign currency translation adjustments	(19)	(12)
Curtailment and special termination benefits	0	0
Other	1	(5)
Projected benefit obligation, End of year	1,084	1,196
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded Status	(1,084)	(1,196)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	0	0
Accounts payable and accrued liabilities	(63)	(64)
Accrued pensions	0	0
Other postretirement benefits	(1,021)	(1,132)
Net liability recognized	$ (1,084)	$ (1,196)