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Derivative Instruments and Hedging Activities - Offsetting Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative assets
Derivative assets, gross amount	$ 6,617	$ 1,729
Derivative assets, offsetting financial instruments	(1,021)	(347)
Derivative assets, offsetting cash collateral	(2,546)	(286)
Total derivative assets	3,050	1,096
Derivative assets, securities not netted	0	0
Net Exposure	3,050	1,096
Derivative, collateral, obligation to return cash	2,700	347
Derivative, collateral, obligation to return securities	1	1
Derivative, collateral, right to reclaim cash	$ 1,200	$ 954

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