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Segments - Operating Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Total revenue $ 1,384 $ 2,126 $ 4,763 $ 6,198
Total operating profit (loss) (74) (154) (2,124) (5,930)
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Total revenue (27) (44) (100) (147)
Total operating profit (loss) (46) (62) (168) (204)
Other significant items 1   25 11
Operating Segments [Member] | Wellbore Technologies [Member]        
Segment Reporting Information [Line Items]        
Total revenue 361 793 1,494 2,450
Total operating profit (loss) (50) 42 (780) (3,234)
Other significant items 26 41 803 3,384
Operating Segments [Member] | Completion & Production Solutions [Member]        
Segment Reporting Information [Line Items]        
Total revenue 601 728 1,887 1,972
Total operating profit (loss) 25 (24) (946) (1,991)
Other significant items 23 79 1,089 2,029
Operating Segments [Member] | Rig Technologies [Member]        
Segment Reporting Information [Line Items]        
Total revenue 449 649 1,482 1,923
Total operating profit (loss) (3) (110) (230) (501)
Other significant items $ 12 $ 194 $ 270 $ 670