Pension and Postretirement Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Charge for write off of actuarial losses	$ 42	$ 42
Defined benefit plan investment policy description		Investment policy — Target asset allocations of U.S. pension plans are established through an investment policy, which is updated periodically and reviewed by an Investment Committee, comprised of certain company officers and directors. The investment policy allows for a flexible asset allocation mix which is intended to provide appropriate diversification to lessen market volatility while assuming a reasonable level of economic risk.
Period of Forecast		10 years
Percentage change in contributions to multiemployer pension plan	5.00%	5.00%
Minimum [Member] | Green Zone [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Protection Act Zone Funded Percentages	80.00%	80.00%
Minimum [Member] | Yellow Zone [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Protection Act Zone Funded Percentages	65.00%	65.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution range		5.00%
Maximum [Member] | Red Zone [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Protection Act Zone Funded Percentages	65.00%	65.00%
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial (gain) loss for defined benefit plans to be amortized next year		20
Prior service cost, plan amendment
Unrecognized pension expense	491	491	452
Acceptance Rate Of Program	71.00%
Distribution of plan assets		133
Charge for write off of actuarial losses		36
Amount reduction in pension obligations exceeded assets distributed		38
Actuarial loss from change in discount rate		165
Long Term Improvement Rate		0.75%
Mortality actuarial assumption loss		83
Plan asset gains		119
Expected rate of return		7.00%
Projected contributions to be made to the defined benefit pension plans		0
United States Pension Plan of US Entity [Member] | Growth Portfolio [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	46.00%	46.00%
Asset target allocation		45.50%
United States Pension Plan of US Entity [Member] | Immunizing Portfolio [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	53.00%	53.00%
Asset target allocation		53.50%
United States Pension Plan of US Entity [Member] | Liquidity Portfolio [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	1.00%	1.00%
Asset target allocation		5.00%
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial (gain) loss for defined benefit plans to be amortized next year		7
Prior service cost, plan amendment		16
Unrecognized pension expense	106	106	68
Distribution of plan assets		7	2
Charge for write off of actuarial losses		6
Benefit obligations that are not required to be funded	268	268
Projected contributions to be made to the defined benefit pension plans		13
Foreign Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial (gain) loss for defined benefit plans to be amortized next year		0
Prior service cost, plan amendment
Unrecognized pension expense	(9)	(9)	(20)
Distribution of plan assets
Benefit obligations that are not required to be funded	110	110
VENEZUELA | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost, plan amendment					6
Unrecognized pension expense	11	11
CANADA | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Charge for write off of actuarial losses	$ 6