Net Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2017

Brokers And Dealers [Abstract]

Partnership's Net Capital Figures for U.S. and Canada Broker-Dealers Subsidiaries

The following table shows the Partnership’s net capital figures for its U.S. and Canada broker-dealer subsidiaries as of December 31, 2017 and 2016:

	2017			2016
U.S.:
Net capital	$	1,107		$	998
Net capital in excess of the minimum required	$	1,049		$	941
Net capital as a percentage of aggregate debit items		38.1	%		35.0	%
Net capital after anticipated capital withdrawals, as a    percentage of aggregate debit items		21.6	%		23.1	%
Canada:
Regulatory risk-adjusted capital	$	50		$	37
Regulatory risk-adjusted capital in excess of the    minimum required to be held by IIROC	$	42		$	33