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Reclassifications from Accumulated Other Comprehensive Income - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]        
Net losses reclassified from accumulated other comprehensive earnings/(losses) to net earnings (net of tax) $ 33 $ 30 $ 105 $ 113