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Derivative Instruments and Hedging Activities - Offsetting Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative liabilities
Derivative liabilities, gross amount	$ 3,884	$ 1,197
Derivative liabilities, offsetting financial instruments	(1,021)	(347)
Derivative liabilities, offsetting cash collateral	(106)	(176)
Total derivative liabilities	2,757	674
Derivative liabilities, securities collateral not netted	0	0
Net exposure	2,757	674
Repurchase agreements
Gross amounts	399	314
Repurchase agreements, securities sold, offset	0	0
Repurchase agreements, cash collateral pledged, offset	0	0
Net amounts as recognized	399	314
Repurchase agreements, securities collateral not netted	(399)	(314)
Net exposure	0	0
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
Securities sold under repurchase agreements, fair value of collateral	$ 407	$ 320

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