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Reclassifications from Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net loss amounts reclassified from accumulated other comprehensive earnings/(losses) to net earnings (net of tax) $ 28 $ 28 $ 112 $ 206