Pension and Other Postretirement Benefits - Additional Information (Detail)			12 Months Ended
	Jun. 06, 2014 Employees Location	May. 31, 2014 USD ($)	Dec. 31, 2016	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Aug. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine pension benefit obligation				4.29%	4.00%
Average duration refined yield curve model parallels the plans, years				10 years
Defined benefit plan, change in interest cost, before tax					$ 100,000,000
Defined benefit plan, change in interest cost,after tax					$ 65,000,000
Average period of historical returns used to calculate expected future returns, in years					5 years
Expected long term rate of return on plan assets				7.75%	8.00%	8.50%
Decrease in expected long-term rate of return				0.25%
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				$ 470,000,000	$ 501,000,000	$ 462,000,000
Minimum required cash contribution to pension plan in 2015				300,000,000
Expenses related to saving and investment plans				$ 142,000,000	$ 151,000,000	$ 149,000,000
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate				9.60%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate				4.00%
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long term rate of return on plan assets			7.75%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage increase in rate of compensation				3.50%
Average period over which rate of compensation increases, years				5 years
United Steelworkers Labor Agreement [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of labor agreement, in years	5 years
Number of employees covered by labor agreement | Employees	6,100
Number of locations affected by labor agreement | Location	10
Labor agreement expired, date					May 15, 2014
Pretax costs related to preparation for and ratification of new agreement					$ 18,000,000
After-tax costs related to preparation for and ratification of new agreement					$ 12,000,000
Discount rate used to determine pension benefit obligation		4.25%				4.80%
Increase in pension liability, plan amendment		$ 100,000,000
Accumulated (increase) decrease in net actuarial loss after-tax, plan amendment				$ (65,000,000)
Annual decrease in net periodic benefit cost, plan amendment				13,000,000
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine pension benefit obligation						4.80%	4.15%
Accumulated (increase) decrease in net actuarial loss after-tax, plan amendment				59,000,000
Annual decrease in net periodic benefit cost, plan amendment				7,000,000
Decrease in other post benefit liability				90,000,000
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Average period of historical returns used to calculate expected future returns, in years					4 years
Minimum required cash contribution to pension plan in 2015				$ 218,000,000
10-Year Moving Average [Member]
Defined Benefit Plan Disclosure [Line Items]
Period of moving averages used for historical data points used to determine the expected long-term rate of return on plan assets, in years					10 years
20-Year Moving Average [Member]
Defined Benefit Plan Disclosure [Line Items]
Period of moving averages used for historical data points used to determine the expected long-term rate of return on plan assets, in years					20 years