Pension and Other Postretirement Benefits - Additional Information (Detail) - USD ($)	5 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 01, 2016
Defined Benefit Plan Disclosure [Line Items]
Allocated share-based compensation expense	$ 73,000,000		$ 191,000,000	$ 183,000,000
Net periodic benefit cost		$ 21,000,000
Percentage increase in rate of compensation	3.61%	3.61%	3.65%
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		7.47%
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		$ 66,000,000	$ 69,000,000	$ 154,000,000
Expected minimum required cash contribution to pension plans, next year		115,000,000
Expenses related to saving and investment plans		$ 57,000,000	59,000,000	68,000,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer contribution expenses	$ 28,000,000		$ 64,000,000	64,000,000
Discount rate used to determine pension benefit obligation	4.12%	4.12%	4.03%
Pension and other postretirement benefit plan current liability	$ 10,000,000	$ 10,000,000	$ 1,000,000
Pension and other postretirement benefit plan noncurrent liability	$ 1,851,000,000	1,851,000,000	359,000,000
Net periodic benefit cost		$ 83,000,000	$ 106,000,000	$ 101,000,000
Percentage increase in rate of compensation	3.50%	3.50%
Expected long term rate of return on plan assets		7.31%	6.91%	6.91%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer contribution expenses	$ 12,000,000		$ 32,000,000	$ 39,000,000
Discount rate used to determine pension benefit obligation	3.93%	3.93%	4.07%
Pension and other postretirement benefit plan current liability	$ 120,000,000	$ 120,000,000	$ 4,000,000
Pension and other postretirement benefit plan noncurrent liability	1,166,000,000	1,166,000,000	78,000,000
Net periodic benefit cost		$ 21,000,000	(12,000,000)	2,000,000
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Average duration refined yield curve model parallels the plans, years		11 years
Health care cost trend rate		3.60%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Average duration refined yield curve model parallels the plans, years		15 years
Health care cost trend rate		9.60%
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					131,000,000
Pension and other postretirement benefit plan noncurrent liability					2,217,000,000
Pension and other postretirement benefit plan accumulated other comprehensive loss					$ 2,498,000,000
Additional New Direct Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement benefit plan unfunded status	180,000,000	$ 180,000,000
Pension and other postretirement benefit plan current liability	5,000,000	5,000,000
Pension and other postretirement benefit plan noncurrent liability	175,000,000	175,000,000
Pension and other postretirement benefit plan accumulated other comprehensive loss	$ 206,000,000	206,000,000
Total expense related to allocated expense plans		177,000,000	285,000,000	286,000,000
Additional New Direct Plans [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		83,000,000	106,000,000	101,000,000
Additional New Direct Plans [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		21,000,000	$ (12,000,000)	$ 2,000,000
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected minimum required cash contribution to pension plans, next year		$ 60,000,000