Collateralized Agreements and Financings - Offsetting Arrangements (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Collateralized Agreements And Financings [Abstract]
Resale agreements, Gross carrying value	$ 149,386	$ 163,199
Resale agreements, Counterparty Netting	(40,108)	(28,891)
Resale agreements	109,278	134,308
Resale agreements, Counterparty Netting	(8,440)	(4,979)
Resale agreements, Collateral	(98,884)	(125,561)
Resale agreements	1,954	3,768
Securities borrowed, Gross carrying value	190,897	180,203
Securities borrowed, Counterparty Netting	(3,615)	(2,565)
Securities borrowed	187,282	177,638
Securities borrowed, Counterparty Netting	(2,908)	(1,732)
Securities borrowed, Collateral	(173,473)	(167,061)
Securities borrowed	10,901	8,845
Repurchase agreements, Gross carrying value	114,013	114,960
Repurchase agreements, Counterparty Netting	(40,108)	(28,891)
Repurchase agreements	73,905	86,069
Repurchase agreements, Counterparty Netting	(8,440)	(4,979)
Repurchase agreements, Collateral	(63,714)	(78,958)
Repurchase agreements	1,751	2,132
Securities loaned, Gross carrying value	8,871	6,179
Securities loaned, Counterparty Netting	(3,615)	(2,565)
Securities loaned	5,256	3,614
Securities loaned, Counterparty Netting	(2,908)	(1,732)
Securities loaned, Collateral	(2,089)	(1,721)
Securities loaned	$ 259	$ 161

Collateralized agreements and financings.

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Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement.

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Amount, before effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount of liability associated with securities borrowed from entities in exchange for collateral.

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Amount of securities borrowed from entities in exchange for collateral, elected not to be offset, deducted from securities borrowed.

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Amount, after effects of master netting arrangements, deduction of assets not subject to a master netting arrangement and elected not to be offset, of securities borrowed from entities in exchange for collateral, offset against an obligation to return collateral under a master netting arrangement.

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Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of asset associated with securities loaned to entities in exchange for collateral.

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Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset.

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Amount of liability associated with funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price.

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Amount of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price, elected not to be offset, deducted from securities purchased under agreements to resell.

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Amount, after effects of master netting arrangements, deduction of assets not subject to a master netting arrangement and elected not to be offset, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price, offset against an obligation to return collateral.

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Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price, elected not to be offset, deducted from securities sold under agreements to repurchase.

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