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Segment Information - Results of Segment Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Net sales $ 3,069 $ 3,729 $ 10,113 $ 10,487
Earnings from investees 31 17 68 39
Earnings (loss) before interest and income taxes (80) 373 146 811
Flat-Rolled        
Segment Reporting Information [Line Items]        
Net sales 2,277 2,632 7,221 7,114
Earnings from investees 30 15 63 34
Earnings (loss) before interest and income taxes 46 305 275 562
USSE        
Segment Reporting Information [Line Items]        
Net sales 518 767 1,933 2,438
Earnings from investees 0 0 0 0
Earnings (loss) before interest and income taxes (46) 72 (27) 297
Tubular        
Segment Reporting Information [Line Items]        
Net sales 262 313 921 888
Earnings from investees 1 2 5 5
Earnings (loss) before interest and income taxes (25) 7 (21) (55)
Total reportable segments        
Segment Reporting Information [Line Items]        
Net sales 3,057 3,712 10,075 10,440
Earnings from investees 31 17 68 39
Earnings (loss) before interest and income taxes (25) 384 227 804
Other Businesses        
Segment Reporting Information [Line Items]        
Net sales 12 17 38 47
Earnings from investees 0 0 0 0
Earnings (loss) before interest and income taxes 8 16 26 44
Reconciling Items and Eliminations        
Segment Reporting Information [Line Items]        
Net sales 0 0 0 0
Earnings from investees 0 0 0 0
Earnings (loss) before interest and income taxes (63) (27) (107) (37)
Net Sales        
Segment Reporting Information [Line Items]        
Net sales 3,069 3,729 10,113 10,487
Net Sales | Flat-Rolled        
Segment Reporting Information [Line Items]        
Net sales 2,363 2,664 7,471 7,262
Net Sales | USSE        
Segment Reporting Information [Line Items]        
Net sales 521 771 1,942 2,458
Net Sales | Tubular        
Segment Reporting Information [Line Items]        
Net sales 263 315 925 892
Net Sales | Total reportable segments        
Segment Reporting Information [Line Items]        
Net sales 3,147 3,750 10,338 10,612
Net Sales | Other Businesses        
Segment Reporting Information [Line Items]        
Net sales 40 48 126 141
Net Sales | Reconciling Items and Eliminations        
Segment Reporting Information [Line Items]        
Net sales (118) (69) (351) (266)
Intersegment Sales        
Segment Reporting Information [Line Items]        
Net sales 0 0 0 0
Intersegment Sales | Flat-Rolled        
Segment Reporting Information [Line Items]        
Net sales 86 32 250 148
Intersegment Sales | USSE        
Segment Reporting Information [Line Items]        
Net sales 3 4 9 20
Intersegment Sales | Tubular        
Segment Reporting Information [Line Items]        
Net sales 1 2 4 4
Intersegment Sales | Total reportable segments        
Segment Reporting Information [Line Items]        
Net sales 90 38 263 172
Intersegment Sales | Other Businesses        
Segment Reporting Information [Line Items]        
Net sales 28 31 88 94
Intersegment Sales | Reconciling Items and Eliminations        
Segment Reporting Information [Line Items]        
Net sales $ (118) $ (69) $ (351) $ (266)