Variable Interest Entities Reflects adoption of ASU 2015-12 - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Net income (loss) attributable to noncontrolling interests	$ 10	$ 6	$ 19	$ (4)
Nonoperating net gain (loss)	36	20	87	18
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Net income (loss) attributable to noncontrolling interests	33	13	66	15
Nonoperating net gain (loss)	12	$ 3	18	$ (3)
Variable Interest Entity, Not Primary Beneficiary [Member] \| Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Net assets of investments funds	$ 5,000		$ 5,000		$ 4,000

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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