Collateralized Agreements and Financings - Offsetting Arrangements (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Collateralized Agreements And Financings [Abstract]
Resale agreements, Gross carrying value	$ 172,342	$ 173,561
Resale agreements, Counterparty Netting	(55,064)	(56,636)
Resale agreements	117,278	116,925
Resale agreements, Counterparty Netting	(16,808)	(8,319)
Resale agreements, Collateral	(99,100)	(107,148)
Resale agreements	1,370	1,458
Securities borrowed, Gross carrying value	193,253	189,571
Securities borrowed, Counterparty Netting	(5,807)	(4,971)
Securities borrowed	187,446	184,600
Securities borrowed, Counterparty Netting	(3,894)	(4,045)
Securities borrowed, Collateral	(170,184)	(170,625)
Securities borrowed	13,368	9,930
Repurchase agreements, Gross carrying value	143,597	128,452
Repurchase agreements, Counterparty Netting	(55,064)	(56,636)
Repurchase agreements	88,533	71,816
Repurchase agreements, Counterparty Netting	(16,808)	(8,319)
Repurchase agreements, Collateral	(70,079)	(62,081)
Repurchase agreements	1,646	1,416
Securities loaned, Gross carrying value	15,505	12,495
Securities loaned, Counterparty Netting	(5,807)	(4,971)
Securities loaned	9,698	7,524
Securities loaned, Counterparty Netting	(3,894)	(4,045)
Securities loaned, Collateral	(5,348)	(3,087)
Securities loaned	$ 456	$ 392

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 of obligation to return securities collateral under master netting arrangements that have not been offset against securities borrowed.

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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 of right to receive securities collateral under master netting arrangements that have not been offset against securities loaned.

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

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Amount, after effects of master netting arrangements, deduction of liabilities not subject to a master netting arrangement and elected not to be offset, of securities loaned to entities in exchange for collateral, offset against a right to receive 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, before 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 assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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 of asset associated with 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.

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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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