FVM - Fair value hierarchy - Assets (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	$ 362,448		$ 341,156
Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	127,514		104,370
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	96,787		72,768
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	11,464		11,161
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	8,867		9,716
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	7,914		6,768
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,971		3,566
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	512		392
Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	121,841		126,210
Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	52,474		53,489
Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	42,558		37,076
Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	22,825		31,404
Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	2,007		1,920
Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,821		1,769
Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	18,007		16,840
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	83,944		82,690
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	559		702
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	15,790		22,493
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,294		9,937
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,536		1,664
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	740		710
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	27,686		21,446
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	19,385		17,236
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	11,438		8,132
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	515		369
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,345		6,667
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,875		2,239
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	515		497
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,955		3,931
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	4,597		4,298
Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	199		82
Level 1
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	161,101		136,026
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	113,634		88,452
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	96,161		72,266
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	9,630		9,554
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	7,088		6,074
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	755		558
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	356		753
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	240		311
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6		0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	7		3
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	40,608		40,204
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	103		123
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	12,089		17,687
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	194		173
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	27,568		21,440
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	653		781
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,906		2,319
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,859		2,171
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	47		149
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 1 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	4,597		4,298
Level 1 | Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	0		0
Level 2
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	194,110		197,331
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	12,068		13,956
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	400		455
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,770		1,607
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,729		3,200
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,617		5,559
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,180		2,886
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	372		248
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	120,222		124,033
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	52,227		53,148
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	42,288		36,658
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	22,220		30,905
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,612		1,444
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,820		1,768
Level 2 | Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	18,007		16,840
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	39,373		38,073
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	4		62
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,700		4,806
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,148		9,899
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	448		428
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	118		5
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	18,732		16,455
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	10,206		6,380
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	16		38
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	4,439		4,347
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	16		69
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	468		348
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,955		3,931
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 2 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	0		0
Level 2 | Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	0		82
Level 3
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	7,237		7,800
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,812		1,962
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	226		46
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	64		0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	50		442
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	542		651
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	791		680
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	140		144
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,264		1,424
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	8		30
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	263		418
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	597		496
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	394		476
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		2
Level 3 | Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,963		4,413
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	452		517
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	147		39
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,536		1,664
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	98		109
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,231		1,752
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	499		331
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	0		0
Level 3 | Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	199		0
UBS AG
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	362,322		340,999
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	127,695		104,513
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	96,788		72,771
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	11,464		11,161
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	8,867		6,074
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	8,093		558
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,971		0
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	512		0
UBS AG | Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	121,843		126,212
UBS AG | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	52,476		53,492
UBS AG | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	42,558		37,076
UBS AG | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	22,825		31,404
UBS AG | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	2,007		1,920
UBS AG | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,821		1,769
UBS AG | Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	18,007		16,840
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	83,636		82,387
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	559		702
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	15,790		22,493
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,294		9,937
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,536	[3]	1,664
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	432		407
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	27,686		21,446
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	19,385		17,236
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	11,438		8,132
UBS AG | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	515		369
UBS AG | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,345		6,667
UBS AG | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,875		2,239
UBS AG | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	515		497
UBS AG | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,955		3,931
UBS AG | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	4,597		4,298
UBS AG | Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1],[3]	199		82
UBS AG | Level 1
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	161,102		136,029
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	113,635		88,455
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	96,162		72,270
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	9,630		9,554
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	7,088		3,200
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	755		5,699
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		2,886
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		248
UBS AG | Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	356		753
UBS AG | Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	240		311
UBS AG | Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	7		3
UBS AG | Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	40,608		40,204
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	103		123
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	12,089		17,687
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0	[3]	0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	194		173
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	27,568		21,440
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	653		781
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,906		2,319
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,859		2,171
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	47		149
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 1 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	4,597		4,298
UBS AG | Level 1 | Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1],[3]	0		0
UBS AG | Level 2
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	193,983		197,170
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	12,248		14,096
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	400		455
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,770		1,607
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,729		442
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,796		651
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,180		680
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	372		144
UBS AG | Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	120,224		124,035
UBS AG | Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	52,228		53,151
UBS AG | Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	42,288		36,658
UBS AG | Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	22,220		30,905
UBS AG | Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,612		1,444
UBS AG | Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,820		1,768
UBS AG | Level 2 | Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	18,007		16,840
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	39,065		37,770
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	4		62
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,700		4,806
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	6,148		9,899
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0	[3]	0
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	140		125
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	118		5
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	18,732		16,455
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	10,206		6,380
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	16		38
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	4,439		4,347
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	16		69
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	468		348
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,955		3,931
UBS AG | Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 2 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	0		0
UBS AG | Level 2 | Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1],[3]	0		82
UBS AG | Level 3
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	7,237		7,800
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,812		1,962
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	226		46
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	64		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	50		9,716
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	542		6,908
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	791		3,566
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	140		392
UBS AG | Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,264		1,424
UBS AG | Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	8		30
UBS AG | Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	263		418
UBS AG | Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	597		496
UBS AG | Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	394		476
UBS AG | Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		2
UBS AG | Level 3 | Measured at fair value on a recurring basis | Brokerage receivables
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	3,962		4,413
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	451		517
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	147		39
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction-rate securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,536	[3]	1,664
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	98		109
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1],[2]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	1,231		1,752
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	499		331
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Other
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1]	0		0
UBS AG | Level 3 | Measured at fair value on a non-recurring basis | Other non-financial assets
Disclosure Of Fair Value Measurement Of Assets [Line Items]
Other non-financial assets, at fair value	[1],[3]	$ 199		$ 0

[1] Bifurcated embedded derivatives are presented on the same balance sheet lines as their host contracts and are not included in this table. The fair value of these derivatives was not material for the periods presented

[2] Fair value hierarchy information for Financial assets for unit-linked investment contracts in the comparative period has been restated, resulting in an increase in Level 1 assets of USD 4,746 million as of 31 December 2018, with a corresponding decrease in Level 2 assets.

[3] Other non-financial assets primarily consist of properties and other non-current assets held for sale, which are measured at the lower of their net carrying amount or fair value less costs to sell.