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Reclassifications from Accumulated Other Comprehensive Income - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]        
Transfer of realized losses/(gains) in fair value to earnings $ 143 $ 231 $ 39 $ 111