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Derivative Instruments and Hedging Activities - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain (net after-tax) recorded in AOCI related to derivatives designated as cash flow hedges expected to be reclassified to earnings over the next 12 months $ 644
Maximum length of time over which forecasted transactions were hedged, years 7 years