Pension and Other Postretirement Benefits - Additional Information (Detail)					3 Months Ended								12 Months Ended
		Dec. 16, 2021 USD ($)	Nov. 23, 2021 USD ($)	Oct. 19, 2021 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) Retiree	Dec. 31, 2022 USD ($) Employees	Sep. 30, 2022 USD ($) Retiree	Dec. 31, 2021 USD ($) Employees Retiree	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) Employee	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) Employees	Dec. 31, 2022 USD ($) Employees	Dec. 31, 2021 USD ($) Employees	Aug. 11, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of employees covered under defined benefit plans | Employees							4,400		14,000					530	4,400	14,000
Increase (decrease) in other noncurrent assets														$ 210,000,000	$ 87,000,000	$ 160,000,000
Fair value of plan assets							$ 2,426,000,000							$ 2,206,000,000	$ 2,426,000,000
Health care cost trend rate assumed for next year							7.00%		5.50%					6.50%	7.00%	5.50%
Cash contribution to pension plans														$ 24,000,000	$ 17,000,000	$ 579,000,000
Company's contribution														0	0	500,000,000
Expenses related to saving and investment plans														80,000,000	71,000,000	72,000,000
Expenses related to member-funded pension plan							$ 17,000,000		$ 17,000,000					$ 16,000,000	17,000,000	17,000,000
Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long term rate of return on plan assets													6.13%
Health care cost trend rate assumed for next year													6.50%
Expected minimum required cash contribution to pension plans, next year													$ 60,000,000
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate yield curve														10 years
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan obligations							1,113,000,000							$ 1,119,000,000	1,113,000,000
Fair value of plan assets							1,064,000,000							1,054,000,000	1,064,000,000
Funded status							$ (49,000,000)							(65,000,000)	(49,000,000)
United States [Member] | Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected minimum required cash contribution to pension plans, next year													$ 40,000,000
Warrick Rolling Mill [Member] | Held for Sale [Member]
Defined Benefit Plan Disclosure [Line Items]
Sale transaction value of waste processing												$ 670,000,000
Assumption of other postretirement benefit liabilities												69,000,000
Action# 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to accrued other pension benefits liability						$ 15,000,000								15,000,000
Decrease to accrued other postretirement benefits						$ (9,000,000)								$ (9,000,000)
Number of employees affected the change in defined benefit plans | Employees														370
Action# 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirees | Retiree						530
Plan obligations						$ 235,000,000
Increase (decrease) in other noncurrent assets						(5,000,000)								$ (5,000,000)
Increase (decrease) to accrued other pension benefits liability						22,000,000								22,000,000
Settlement of certain other postretirement benefits						(21,000,000)								$ 21,000,000
Non-cash settlement loss after tax						$ 16,000,000
Number of employees affected the change in defined benefit plans | Employees														530
Action# 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in other noncurrent assets					$ (2,000,000)									$ (2,000,000)
Number of employees affected the change in defined benefit plans | Employees														50
Action# 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirees | Retiree								4,400
Plan obligations																	$ 1,000,000,000
Increase (decrease) in other noncurrent assets								$ 27,000,000							27,000,000
Increase (decrease) to accrued other pension benefits liability								5,000,000							5,000,000
Settlement of certain other postretirement benefits								(617,000,000)							$ 617,000,000
Number of employees affected the change in defined benefit plans | Employees							4,400								4,400
Action# 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement of certain other postretirement benefits								(11,000,000)							$ 11,000,000
Number of employees affected the change in defined benefit plans | Employees							45								45
Action# 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in other noncurrent assets								(12,000,000)							$ (12,000,000)
Increase (decrease) to accrued other pension benefits liability								23,000,000							23,000,000
Settlement of certain other postretirement benefits								(1,000,000)							$ 1,000,000
Number of employees affected the change in defined benefit plans | Employees							5								5
Action# 4 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in other noncurrent assets								21,000,000							$ 21,000,000
Settlement of certain other postretirement benefits								$ 3,000,000							$ (3,000,000)
Number of employees affected the change in defined benefit plans | Employees							25								25
Action# 5 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to accrued other pension benefits liability							$ 3,000,000								$ 3,000,000
Settlement of certain other postretirement benefits							$ (6,000,000)								$ 6,000,000
Number of employees affected the change in defined benefit plans | Employees							20								20
Action# 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement of certain other postretirement benefits																26,000,000
Decrease to accrued other postretirement benefits																(106,000,000)
Curtailment charge (gain)																$ 17,000,000
Number of employees affected the change in defined benefit plans | Employees									840							840
Action# 1 [Member] | Warrick Rolling Mill [Member] | Held for Sale [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement of certain other postretirement benefits												(26,000,000)
Sale transaction value of waste processing												670,000,000
Assumption of other postretirement benefit liabilities												$ 69,000,000
Number of employees | Employee												1,150
Decrease to accrued other postretirement benefits												$ (40,000,000)
Remeasurement to accrued other postretirement benefits liability												69,000,000
Curtailment charge (gain)												$ (17,000,000)
Action# 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to accrued other pension benefits liability																$ (90,000,000)
Settlement of certain other postretirement benefits																$ 39,000,000
Number of employees affected the change in defined benefit plans | Employees									120							120
Action# 2 [Member] | Warrick Rolling Mill [Member] | Held for Sale [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to accrued other pension benefits liability											$ (90,000,000)
Settlement of certain other postretirement benefits											$ (39,000,000)
Action# 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to accrued other pension benefits liability										$ 7,000,000						$ 7,000,000
Settlement of certain other postretirement benefits										(7,000,000)						$ 7,000,000
Number of employees affected the change in defined benefit plans | Employees									20							20
Action# 4 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to accrued other pension benefits liability										(38,000,000)						$ (38,000,000)
Settlement of certain other postretirement benefits										$ (1,000,000)						$ 1,000,000
Number of employees affected the change in defined benefit plans | Employees									20							20
Action# 5 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirees | Retiree									800
Plan obligations				$ 55,000,000
Settlement of certain other postretirement benefits									$ (63,000,000)							$ 63,000,000
Plan assets				$ 55,000,000
Number of employees affected the change in defined benefit plans | Employees									800							800
Action# 6 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirees | Retiree									14,000
Plan obligations		$ 1,540,000,000	$ 1,540,000,000
Increase (decrease) to accrued other pension benefits liability									$ (84,000,000)							$ (84,000,000)
Settlement of certain other postretirement benefits									$ (848,000,000)							$ 848,000,000
Plan assets		$ 1,540,000,000	$ 1,540,000,000
Number of employees affected the change in defined benefit plans | Employees									14,000							14,000
Action# 7 [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to accrued other pension benefits liability									$ (1,000,000)							$ (1,000,000)
Settlement of certain other postretirement benefits									$ (10,000,000)							$ 10,000,000
Number of employees affected the change in defined benefit plans | Employees									60							60
Target Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expenses related to target benefit plan														$ 8,000,000	$ 9,000,000	$ 9,000,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of employees covered under defined benefit plans | Employees														17,000
Plan obligations							$ 2,518,000,000							$ 2,393,000,000	2,518,000,000
Settlement of certain other postretirement benefits	[1],[2]													(21,000,000)	(632,000,000)	$ (968,000,000)
Funded status							84,000,000							$ (174,000,000)	$ 84,000,000
Expected long term rate of return on plan assets														6.21%	4.94%	5.66%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of employees covered under defined benefit plans | Employees														21,000
Settlement of certain other postretirement benefits	[2]															$ (26,000,000)
Curtailment charge (gain)	[3]															$ (17,000,000)
Funded status							$ 536,000,000							$ (494,000,000)	$ 536,000,000

[1] In 2023, 2022, and 2021, net periodic benefit cost for U.S pension plans was $6, $698, and $962, respectively.

[2] These amounts were reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations (see Note D). In 2023, 2022 and 2021, settlements were due to management actions (see Plan Actions above).

[3] These amounts were reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations (see Note D). In 2021, curtailments were due to management actions (see Plan Actions above).