Pension and Other Postretirement Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 01, 2016
Defined Benefit Plan Disclosure [Line Items]
Percentage increase in rate of compensation	3.28%	3.61%
Defined benefit plan, description of basis used to determine overall expected long-term rate-of-return on assets assumption	The expected long-term rate of return on plan assets is generally applied to a five-year market-related value of plan assets (a four-year average or the fair value at the plan measurement date is used for certain non-U.S.plans)
Expected long term rate of return on plan assets	6.89%
Health care cost trend rate assumed for next year	5.50%	5.50%	5.50%
Health care cost trend rate	4.50%	4.50%	4.50%
Number of years over actual annual health care cost trend experience	3 years
Cash contribution to pension plans	$ 106,000,000	$ 66,000,000	$ 69,000,000
Expected minimum required cash contribution to pension plans, next year	290,000,000
Expenses related to saving and investment plans	$ 65,000,000	$ 57,000,000	$ 59,000,000
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected asset class mix percentage	20.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected asset class mix percentage	30.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected asset class mix percentage	50.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine pension benefit obligation	3.68%	4.12%
Pension and other postretirement benefit plan current liability	$ 11,000,000	$ 10,000,000
Pension and other postretirement benefit plan noncurrent liability	$ 2,341,000,000	$ 1,851,000,000
Percentage increase in rate of compensation	3.28%
Expected long term rate of return on plan assets	7.47%	7.31%	6.91%
Expenses related to saving and investment plans		$ 25,000,000	$ 84,000,000
Domestic Plan [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected minimum required cash contribution to pension plans, next year	$ 250,000,000
Domestic Plan [Member] | US and Canadian [Member]
Defined Benefit Plan Disclosure [Line Items]
Discretionary contributions	$ 300,000,000
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	9.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Average duration refined yield curve model parallels the plans, years		12 years
Health care cost trend rate	(0.80%)
New Direct Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine pension benefit obligation				3.48%
Pension and other postretirement benefit plan unfunded status				$ 2,348,000,000
Pension and other postretirement benefit plan current liability				136,000,000
Pension and other postretirement benefit plan noncurrent liability				2,392,000,000
Pension and other postretirement benefit plan accumulated other comprehensive loss				$ 2,704,000,000