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Accumulated Other Comprehensive Income (Loss) -Reclassifications from AOCL to Results of Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss before income taxes $ 215 $ 283 $ 584 $ (1,107)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss before income taxes 5 6 16 17
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss before income taxes $ 8 $ (6) $ 19 $ (5)