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Reclassifications from Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net loss amounts reclassified from accumulated other comprehensive earnings/(losses) to net earnings (net of tax) $ 43 $ 140