Interest Income and Interest Expense - Interest Income and Interest Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income
Deposits with banks	$ 102	$ 35	$ 277	$ 114
Securities borrowed, securities purchased under agreements to resell and federal funds sold	169	15	456	14
Financial instruments owned, at fair value	1,276	1,458	4,098	4,406
Loans receivable	483	314	1,327	840
Other interest	359	297	1,109	930
Total interest income	2,389	2,119	7,267	6,304
Interest expense
Deposits	233	106	627	289
Securities loaned and securities sold under agreements to repurchase	112	88	354	236
Financial instruments sold, but not yet purchased, at fair value	312	344	943	1,001
Short-term secured and unsecured borrowings	105	67	341	318
Long-term secured and unsecured borrowings	1,064	935	2,949	2,843
Other interest	(51)	(263)	(198)	(747)
Total interest expense	1,775	1,277	5,016	3,940
Net interest income	$ 614	$ 842	$ 2,251	$ 2,364