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Pensions and Other Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Jan. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
USSC Pension Plan
Dec. 31, 2012
USSC Pension Plan
Sep. 30, 2013
Steelworkers Pension Trust
Sep. 30, 2013
Other Pension Plans, Defined Benefit
Sep. 30, 2013
Unfunded Other Postretirement Benefit Plans
Sep. 30, 2013
Defined Benefit Postretirement Health Coverage
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Defined Benefit Plan, Contributions by Employer           $ 63   $ 56 $ 18    
Cash contribution by employer to pension plans           140 140     188 10
Cash contribution by employer to defined contribution plans   11 10 33 31            
Amount of voluntary pension funding authorized by the board of directors 300                    
Long-term earnings rate assumption       7.75%              
Estimated future contribution in 2014   140   140              
Estimated future contribution in 2015   $ 140   $ 140