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Derivative Instruments and Hedging Activities - Offsetting Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative assets
Derivative assets, gross amount	$ 4,101	$ 1,729
Derivative assets, offsetting financial instruments	(535)	(347)
Derivative assets, offsetting cash collateral	(1,087)	(286)
Total derivative assets	2,479	1,096
Derivative assets, securities not netted	0	0
Net Exposure	2,479	1,096
Derivative, collateral, obligation to return cash	1,200	347
Derivative, collateral, obligation to return securities	1	1
Derivative, collateral, right to reclaim cash	$ 1,400	$ 954

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