Restructuring and Other Charges -Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 89	$ 128	$ 138	$ 275
Payments for Restructuring		65	173
Great Lakes Works Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		29
Planned Sale of Component Within Flat-Rolled Segment
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		89
Environmental and Other Charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		10
Business Exit And Employee Severance
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring		$ 58	169	35
Business Exit And Employee Severance | Postretirement Benefit Trust (VEBA)
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			38
Idling of Keetac Mining Operations and Portion of Great Lake Works
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges			66
Idling of Lorain Tubular Operations and Lone Star Tubular Operations
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges			25
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges			15
Reductions under Voluntary Early Retirement Program (VERP)
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges			$ 32
U.S. Steel Kosice Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges				25
East Chicago Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges				227
Headcount Reductions
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges				$ 23