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Reclassifications from Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net loss amounts reclassified from accumulated other comprehensive earnings / (losses) to net earnings (net of tax) $ 250 $ 350 $ 79