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Derivative Instruments and Hedging Activities - Offsetting Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative liabilities
Derivative liabilities, gross amount	$ 2,214	$ 1,197
Derivative liabilities, offsetting financial instruments	(702)	(347)
Derivative liabilities, offsetting cash collateral	(52)	(176)
Total derivative liabilities	1,460	674
Derivative liabilities, securities collateral not netted	0	0
Net exposure	1,460	674
Repurchase agreements
Gross amounts	573	314
Repurchase agreements, securities sold, offset	0	0
Repurchase agreements, cash collateral pledged, offset	0	0
Net amounts as recognized	573	314
Repurchase agreements, securities collateral not netted	(573)	(314)
Net exposure	0	0
Derivative, collateral, obligation to return cash	1,700	347
Derivative, collateral, obligation to return securities	1	1
Derivative, collateral, right to reclaim cash	1,300	954
Securities sold under repurchase agreements, fair value of collateral	$ 584	$ 320

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