Litigation, regulatory and similar matters (Detail 2) - USD ($) $ in Millions		Jun. 30, 2021		Mar. 31, 2021		Dec. 31, 2020
Disclosure Of Other Provisions [Line Items]
Balance		$ 2,646		$ 2,481		$ 2,571
Litigation, regulatory and similar matters
Disclosure Of Other Provisions [Line Items]
Balance	[2]	2,119	[1]	2,072	[1]	2,135
Litigation, regulatory and similar matters | Global Wealth Management
Disclosure Of Other Provisions [Line Items]
Balance	[2]	800		810		861
Litigation, regulatory and similar matters | Personal & Corporate Banking
Disclosure Of Other Provisions [Line Items]
Balance	[2]	100		109		115
Litigation, regulatory and similar matters | Asset Management
Disclosure Of Other Provisions [Line Items]
Balance	[2]	1		1		0
Litigation, regulatory and similar matters | Investment Bank
Disclosure Of Other Provisions [Line Items]
Balance	[2]	282		217		227
Litigation, regulatory and similar matters | Group Functions
Disclosure Of Other Provisions [Line Items]
Balance	[2]	$ 936		$ 935		$ 932

[1] <div>Comprises provisions for losses resulting from legal, liability and compliance risks</div>

[2] <div>Provisions, if any, for matters described in this Note are recorded in Global Wealth Management (item 3 and item 4) and Group Functions (item 2). Provisions, if any, for the matters described in items 1 and 6 of this Note are allocated between Global Wealth Management and Personal & Corporate Banking, and provisions, if any, for the matters described in this Note in item 5 are allocated between the Investment Bank and Group Functions.</div>