Collateralized Agreements and Financings - Offsetting Arrangements (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Collateralized Agreements And Financings [Abstract]
Resale agreements, Gross carrying value	$ 167,540	$ 152,982
Resale agreements, Counterparty Netting	(66,263)	(67,291)
Resale agreements	101,277	85,691
Resale agreements, Counterparty Netting	(8,789)	(3,058)
Resale agreements, Collateral	(90,529)	(78,528)
Resale agreements	1,959	4,105
Securities borrowed, Gross carrying value	131,829	140,677
Securities borrowed, Counterparty Netting	(4,438)	(4,606)
Securities borrowed	127,391	136,071
Securities borrowed, Counterparty Netting	(2,776)	(2,211)
Securities borrowed, Collateral	(115,734)	(127,901)
Securities borrowed	8,881	5,959
Repurchase agreements, Gross carrying value	167,542	185,047
Repurchase agreements, Counterparty Netting	(66,263)	(67,291)
Repurchase agreements	101,279	117,756
Repurchase agreements, Counterparty Netting	(8,789)	(3,058)
Repurchase agreements, Collateral	(91,651)	(114,065)
Repurchase agreements	839	633
Securities loaned, Gross carrying value	21,726	19,591
Securities loaned, Counterparty Netting	(4,438)	(4,606)
Securities loaned	17,288	14,985
Securities loaned, Counterparty Netting	(2,776)	(2,211)
Securities loaned, Collateral	(14,311)	(12,614)
Securities loaned	$ 201	$ 160

Collateralized agreements and financings.

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