Maturity analysis of assets, liabilities and off-balance sheet commitments - Maturity analysis of assets, liabilities and off-balance sheet commitments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financial assets
Cash and balances at central banks	$ 304,481	$ 154,099	$ 162,843
Items in the course of collection from other banks	4,094	4,956	5,787
Hong Kong Government certificates of indebtedness	40,420	38,380
– trading assets	231,990	254,271
Financial assets designated or otherwise mandatorily measured at fair value	45,553	43,627
Derivatives	307,726	242,995
Loans and advances to banks and other financial institutions	81,616	69,203
Loans and advances to customers	1,037,987	1,036,743	981,696
– personal	456,078	431,137
– corporate and commercial	517,594	535,061
– financial	64,315	70,545
Reverse repurchase agreements – non-trading	230,628	240,862
Financial investments	490,693	443,312
Accrued income and other financial assets	105,563	92,979
Financial assets	2,880,751	2,621,427
Non-financial assets	103,413	93,725
Total assets	2,984,164	2,715,152	2,558,124
Off-balance sheet commitments received
Loan and other credit-related commitments	60,849	63,199
Financial liabilities
Hong Kong currency notes in circulation	40,420	38,380
Deposits from banks	82,080	59,022
Customer accounts	1,642,780	1,439,115	1,362,643
– personal	832,278	747,252
– corporate and commercial	624,171	519,317
– financial	186,331	172,546
Repurchase agreements – non-trading	111,901	140,344
Items in the course of transmission to other banks	4,343	4,817	5,641
Trading liabilities	75,266	83,170
Financial liabilities designated at fair value	157,439	164,466
Derivatives	303,001	239,497
Debt securities in issue	95,492	104,555
Accruals and other financial liabilities	120,341	111,395
Subordinated liabilities	21,951	24,600
Financial liabilities	2,655,014	2,409,361
Non-financial liabilities	124,155	113,123
Total liabilities	2,779,169	2,522,484
Off-balance sheet commitments given
Loan and other credit-related commitments	844,770	797,608
Customer accounts, insured by guarantee schemes	463,524	408,090
HSBC Holdings
Financial assets
– balances with HSBC undertakings	2,913	2,382	$ 3,509
Financial assets designated or otherwise mandatorily measured at fair value	65,253	61,964
Derivatives	4,698	2,002
Loans and advances to banks and other financial institutions	10,443	10,218
Financial assets with HSBC undertakings designated and otherwise mandatorily measured at fair value	65,253	61,964
Financial investments	17,485	16,106
Accrued income and other financial assets	1,445	543
Financial assets	102,237	93,215
Non-financial assets	160,936	162,025
Total assets	263,173	255,240
Financial liabilities
Amounts owed to HSBC undertakings	330	464
Financial liabilities designated at fair value	25,664	30,303
Derivatives	3,060	2,021
Debt securities in issue	64,029	56,844
Accruals and other financial liabilities	4,865	1,877
Subordinated liabilities	17,916	18,361
Financial liabilities	115,864	109,870
Non-financial liabilities	509	326
Total liabilities	116,373	110,196
Off-balance sheet commitments given
Loan and other credit-related commitments	0	0
Personal
Off-balance sheet commitments given
Loan and other credit-related commitments	236,551	223,153
Corporate and commercial
Off-balance sheet commitments given
Loan and other credit-related commitments	472,218	461,518
Financial
Off-balance sheet commitments given
Loan and other credit-related commitments	136,001	112,937
Debt securities in issue
Financial liabilities
Financial liabilities	218,108	236,323
Debt securities in issue \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	19,624	24,687
Financial liabilities	83,653	81,531
– debt securities in issue: covered bonds
Financial liabilities
Financial liabilities designated at fair value	4,157	4,961
Debt securities in issue	3,052	1,747
– debt securities in issue: unsecured
Financial liabilities
Financial liabilities designated at fair value	116,878	125,402
Debt securities in issue	84,256	97,542
– subordinated liabilities and preferred securities
Financial liabilities
Financial liabilities designated at fair value	10,844	10,550
– subordinated liabilities and preferred securities \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	6,040	5,616
– other
Financial liabilities
Financial liabilities designated at fair value	25,560	23,553
– debt securities in issue: otherwise secured
Financial liabilities
Debt securities in issue	8,184	5,266
Cash prime brokerage balances
Financial liabilities
Financial liabilities designated at fair value	3,889
Due not more than 1 month
Financial assets
Cash and balances at central banks	304,481	154,099
Items in the course of collection from other banks	4,094	4,956
Hong Kong Government certificates of indebtedness	40,420	38,380
– trading assets	228,434	252,009
Financial assets designated or otherwise mandatorily measured at fair value	3,061	4,846
Derivatives	306,561	241,941
Loans and advances to banks and other financial institutions	51,652	41,554
Loans and advances to customers	172,306	190,675
– personal	51,711	51,893
– corporate and commercial	101,684	118,585
– financial	18,911	20,197
Reverse repurchase agreements – non-trading	157,234	164,741
Financial investments	47,270	36,128
Accrued income and other financial assets	93,118	80,661
Financial assets	1,408,631	1,209,990
Non-financial assets	0	0
Total assets	1,408,631	1,209,990
Off-balance sheet commitments received
Loan and other credit-related commitments	60,849	63,199
Financial liabilities
Hong Kong currency notes in circulation	40,420	38,380
Deposits from banks	60,973	46,397
Customer accounts	1,533,595	1,287,358
– personal	766,631	646,843
– corporate and commercial	588,887	479,763
– financial	178,077	160,752
Repurchase agreements – non-trading	102,633	132,042
Items in the course of transmission to other banks	4,343	4,817
Trading liabilities	70,799	82,130
Financial liabilities designated at fair value	18,434	12,844
Derivatives	300,902	237,901
Debt securities in issue	6,552	8,183
Accruals and other financial liabilities	96,821	87,796
Subordinated liabilities	619	1,502
Financial liabilities	2,236,091	1,939,350
Non-financial liabilities	0	0
Total liabilities	2,236,091	1,939,350
Off-balance sheet commitments given
Loan and other credit-related commitments	842,974	794,336
Due not more than 1 month \| HSBC Holdings
Financial assets
– balances with HSBC undertakings	2,913	2,382
Derivatives	1,473	596
Loans and advances to banks and other financial institutions	0	102
Financial assets with HSBC undertakings designated and otherwise mandatorily measured at fair value	0	0
Financial investments	3,701	2,754
Accrued income and other financial assets	1,015	93
Financial assets	9,102	5,927
Non-financial assets	0	0
Total assets	9,102	5,927
Financial liabilities
Amounts owed to HSBC undertakings	0	0
Financial liabilities designated at fair value	0	0
Derivatives	3,052	1,838
Debt securities in issue	0	0
Accruals and other financial liabilities	3,769	900
Subordinated liabilities	0	1,503
Financial liabilities	6,821	4,241
Non-financial liabilities	0	0
Total liabilities	6,821	4,241
Off-balance sheet commitments given
Loan and other credit-related commitments	0	0
Due not more than 1 month \| Personal
Off-balance sheet commitments given
Loan and other credit-related commitments	235,606	221,952
Due not more than 1 month \| Corporate and commercial
Off-balance sheet commitments given
Loan and other credit-related commitments	471,410	460,569
Due not more than 1 month \| Financial
Off-balance sheet commitments given
Loan and other credit-related commitments	135,958	111,815
Due not more than 1 month \| Debt securities in issue \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	0	0
Due not more than 1 month \| – debt securities in issue: covered bonds
Financial liabilities
Financial liabilities designated at fair value	0	0
Debt securities in issue	0	0
Due not more than 1 month \| – debt securities in issue: unsecured
Financial liabilities
Financial liabilities designated at fair value	10,762	8,884
Debt securities in issue	5,458	6,168
Due not more than 1 month \| – subordinated liabilities and preferred securities
Financial liabilities
Financial liabilities designated at fair value	0	23
Due not more than 1 month \| – subordinated liabilities and preferred securities \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	0	0
Due not more than 1 month \| – other
Financial liabilities
Financial liabilities designated at fair value	7,672	3,937
Due not more than 1 month \| – debt securities in issue: otherwise secured
Financial liabilities
Debt securities in issue	1,094	2,015
Due over 1 month but not more than 3 months
Financial assets
Cash and balances at central banks	0	0
Items in the course of collection from other banks	0	0
Hong Kong Government certificates of indebtedness	0	0
– trading assets	1,778	644
Financial assets designated or otherwise mandatorily measured at fair value	240	74
Derivatives	15	150
Loans and advances to banks and other financial institutions	11,283	7,826
Loans and advances to customers	70,746	82,379
– personal	9,645	14,547
– corporate and commercial	55,009	61,629
– financial	6,092	6,203
Reverse repurchase agreements – non-trading	44,658	38,997
Financial investments	77,450	64,472
Accrued income and other financial assets	5,951	5,544
Financial assets	212,121	200,086
Non-financial assets	0	0
Total assets	212,121	200,086
Off-balance sheet commitments received
Loan and other credit-related commitments	0	0
Financial liabilities
Hong Kong currency notes in circulation	0	0
Deposits from banks	1,396	4,167
Customer accounts	61,376	81,038
– personal	32,429	49,405
– corporate and commercial	22,856	24,214
– financial	6,091	7,419
Repurchase agreements – non-trading	3,979	3,402
Items in the course of transmission to other banks	0	0
Trading liabilities	3,377	209
Financial liabilities designated at fair value	7,333	4,667
Derivatives	264	105
Debt securities in issue	12,329	17,374
Accruals and other financial liabilities	9,794	9,078
Subordinated liabilities	0	0
Financial liabilities	99,848	120,040
Non-financial liabilities	0	0
Total liabilities	99,848	120,040
Off-balance sheet commitments given
Loan and other credit-related commitments	435	600
Due over 1 month but not more than 3 months \| HSBC Holdings
Financial assets
– balances with HSBC undertakings	0	0
Derivatives	0	0
Loans and advances to banks and other financial institutions	600	672
Financial assets with HSBC undertakings designated and otherwise mandatorily measured at fair value	451	0
Financial investments	3,769	3,493
Accrued income and other financial assets	275	277
Financial assets	5,095	4,442
Non-financial assets	0	0
Total assets	5,095	4,442
Financial liabilities
Amounts owed to HSBC undertakings	330	464
Financial liabilities designated at fair value	984	0
Derivatives	0	0
Debt securities in issue	503	0
Accruals and other financial liabilities	689	574
Subordinated liabilities	0	0
Financial liabilities	2,506	1,038
Non-financial liabilities	0	0
Total liabilities	2,506	1,038
Off-balance sheet commitments given
Loan and other credit-related commitments	0	0
Due over 1 month but not more than 3 months \| Personal
Off-balance sheet commitments given
Loan and other credit-related commitments	172	40
Due over 1 month but not more than 3 months \| Corporate and commercial
Off-balance sheet commitments given
Loan and other credit-related commitments	250	117
Due over 1 month but not more than 3 months \| Financial
Off-balance sheet commitments given
Loan and other credit-related commitments	13	443
Due over 1 month but not more than 3 months \| Debt securities in issue \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	984	0
Due over 1 month but not more than 3 months \| – debt securities in issue: covered bonds
Financial liabilities
Financial liabilities designated at fair value	0	0
Debt securities in issue	0	0
Due over 1 month but not more than 3 months \| – debt securities in issue: unsecured
Financial liabilities
Financial liabilities designated at fair value	4,470	2,046
Debt securities in issue	10,744	17,372
Due over 1 month but not more than 3 months \| – subordinated liabilities and preferred securities
Financial liabilities
Financial liabilities designated at fair value	0	0
Due over 1 month but not more than 3 months \| – subordinated liabilities and preferred securities \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	0	0
Due over 1 month but not more than 3 months \| – other
Financial liabilities
Financial liabilities designated at fair value	2,863	2,621
Due over 1 month but not more than 3 months \| – debt securities in issue: otherwise secured
Financial liabilities
Debt securities in issue	1,585	2
Due over 3 months but not more than 6 months
Financial assets
Cash and balances at central banks	0	0
Items in the course of collection from other banks	0	0
Hong Kong Government certificates of indebtedness	0	0
– trading assets	458	412
Financial assets designated or otherwise mandatorily measured at fair value	466	381
Derivatives	12	24
Loans and advances to banks and other financial institutions	5,640	4,877
Loans and advances to customers	65,838	61,254
– personal	7,918	8,562
– corporate and commercial	51,755	45,924
– financial	6,165	6,768
Reverse repurchase agreements – non-trading	16,655	17,933
Financial investments	44,255	35,795
Accrued income and other financial assets	2,743	2,532
Financial assets	136,067	123,208
Non-financial assets	0	0
Total assets	136,067	123,208
Off-balance sheet commitments received
Loan and other credit-related commitments	0	0
Financial liabilities
Hong Kong currency notes in circulation	0	0
Deposits from banks	714	2,773
Customer accounts	22,568	38,343
– personal	15,511	29,320
– corporate and commercial	5,963	7,162
– financial	1,094	1,861
Repurchase agreements – non-trading	2,165	1,579
Items in the course of transmission to other banks	0	0
Trading liabilities	400	265
Financial liabilities designated at fair value	6,973	4,236
Derivatives	198	73
Debt securities in issue	14,964	12,799
Accruals and other financial liabilities	3,886	3,914
Subordinated liabilities	237	22
Financial liabilities	52,105	64,004
Non-financial liabilities	0	0
Total liabilities	52,105	64,004
Off-balance sheet commitments given
Loan and other credit-related commitments	172	590
Due over 3 months but not more than 6 months \| HSBC Holdings
Financial assets
– balances with HSBC undertakings	0	0
Derivatives	5	0
Loans and advances to banks and other financial institutions	120	120
Financial assets with HSBC undertakings designated and otherwise mandatorily measured at fair value	0	0
Financial investments	2,924	1,873
Accrued income and other financial assets	100	97
Financial assets	3,149	2,090
Non-financial assets	0	0
Total assets	3,149	2,090
Financial liabilities
Amounts owed to HSBC undertakings	0	0
Financial liabilities designated at fair value	859	0
Derivatives	0	0
Debt securities in issue	1,621	0
Accruals and other financial liabilities	301	303
Subordinated liabilities	0	0
Financial liabilities	2,781	303
Non-financial liabilities	0	0
Total liabilities	2,781	303
Off-balance sheet commitments given
Loan and other credit-related commitments	0	0
Due over 3 months but not more than 6 months \| Personal
Off-balance sheet commitments given
Loan and other credit-related commitments	27	39
Due over 3 months but not more than 6 months \| Corporate and commercial
Off-balance sheet commitments given
Loan and other credit-related commitments	138	96
Due over 3 months but not more than 6 months \| Financial
Off-balance sheet commitments given
Loan and other credit-related commitments	7	455
Due over 3 months but not more than 6 months \| Debt securities in issue \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	859	0
Due over 3 months but not more than 6 months \| – debt securities in issue: covered bonds
Financial liabilities
Financial liabilities designated at fair value	0	0
Debt securities in issue	28	0
Due over 3 months but not more than 6 months \| – debt securities in issue: unsecured
Financial liabilities
Financial liabilities designated at fair value	5,522	2,946
Debt securities in issue	13,935	12,551
Due over 3 months but not more than 6 months \| – subordinated liabilities and preferred securities
Financial liabilities
Financial liabilities designated at fair value	0	0
Due over 3 months but not more than 6 months \| – subordinated liabilities and preferred securities \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	0	0
Due over 3 months but not more than 6 months \| – other
Financial liabilities
Financial liabilities designated at fair value	1,451	1,290
Due over 3 months but not more than 6 months \| – debt securities in issue: otherwise secured
Financial liabilities
Debt securities in issue	1,001	248
Due over 6 months but not more than 9 months
Financial assets
Cash and balances at central banks	0	0
Items in the course of collection from other banks	0	0
Hong Kong Government certificates of indebtedness	0	0
– trading assets	135	62
Financial assets designated or otherwise mandatorily measured at fair value	262	200
Derivatives	14	27
Loans and advances to banks and other financial institutions	3,068	2,592
Loans and advances to customers	44,392	36,005
– personal	7,270	7,245
– corporate and commercial	31,529	25,006
– financial	5,593	3,754
Reverse repurchase agreements – non-trading	5,113	8,226
Financial investments	14,523	17,485
Accrued income and other financial assets	475	915
Financial assets	67,982	65,512
Non-financial assets	0	0
Total assets	67,982	65,512
Off-balance sheet commitments received
Loan and other credit-related commitments	0	0
Financial liabilities
Hong Kong currency notes in circulation	0	0
Deposits from banks	695	454
Customer accounts	9,375	11,530
– personal	6,276	8,484
– corporate and commercial	2,966	2,621
– financial	133	425
Repurchase agreements – non-trading	386	1,882
Items in the course of transmission to other banks	0	0
Trading liabilities	143	148
Financial liabilities designated at fair value	6,775	4,552
Derivatives	38	10
Debt securities in issue	9,764	13,152
Accruals and other financial liabilities	692	1,244
Subordinated liabilities	0	1,993
Financial liabilities	27,868	34,965
Non-financial liabilities	0	0
Total liabilities	27,868	34,965
Off-balance sheet commitments given
Loan and other credit-related commitments	243	313
Due over 6 months but not more than 9 months \| HSBC Holdings
Financial assets
– balances with HSBC undertakings	0	0
Derivatives	0	0
Loans and advances to banks and other financial institutions	0	25
Financial assets with HSBC undertakings designated and otherwise mandatorily measured at fair value	0	0
Financial investments	799	2,251
Accrued income and other financial assets	33	48
Financial assets	832	2,324
Non-financial assets	0	0
Total assets	832	2,324
Financial liabilities
Amounts owed to HSBC undertakings	0	0
Financial liabilities designated at fair value	0	0
Derivatives	0	0
Debt securities in issue	563	0
Accruals and other financial liabilities	57	55
Subordinated liabilities	0	0
Financial liabilities	620	55
Non-financial liabilities	0	0
Total liabilities	620	55
Off-balance sheet commitments given
Loan and other credit-related commitments	0	0
Due over 6 months but not more than 9 months \| Personal
Off-balance sheet commitments given
Loan and other credit-related commitments	47	56
Due over 6 months but not more than 9 months \| Corporate and commercial
Off-balance sheet commitments given
Loan and other credit-related commitments	194	52
Due over 6 months but not more than 9 months \| Financial
Off-balance sheet commitments given
Loan and other credit-related commitments	2	205
Due over 6 months but not more than 9 months \| Debt securities in issue \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	0	0
Due over 6 months but not more than 9 months \| – debt securities in issue: covered bonds
Financial liabilities
Financial liabilities designated at fair value	0	0
Debt securities in issue	0	0
Due over 6 months but not more than 9 months \| – debt securities in issue: unsecured
Financial liabilities
Financial liabilities designated at fair value	5,604	3,757
Debt securities in issue	8,764	12,991
Due over 6 months but not more than 9 months \| – subordinated liabilities and preferred securities
Financial liabilities
Financial liabilities designated at fair value	0	0
Due over 6 months but not more than 9 months \| – subordinated liabilities and preferred securities \| HSBC Holdings
Financial liabilities
Financial liabilities designated at fair value	0	0
Due over 6 months but not more than 9 months \| – other
Financial liabilities
Financial liabilities designated at fair value	1,171	795
Due over 6 months but not more than 9 months \| – debt securities in issue: otherwise secured
Financial liabilities
Debt securities in issue	1,000	161
Due over 9 months but not more than 1 year
Financial assets
Cash and balances at central banks	0	0
Items in the course of collection from other banks	0	0
Hong Kong Government certificates of indebtedness	0	0
– trading assets	67	452
Financial assets designated or otherwise mandatorily measured at fair value	454	422
Derivatives	14	22
Loans and advances to banks and other financial institutions	2,284	2,859
Loans and advances to customers	38,606	36,755
– personal	7,033	6,931
– corporate and commercial	28,553	25,069

Maturity analysis of assets, liabilities and off-balance sheet commitments - Maturity analysis of assets, liabilities and off-balance sheet commitments (Details) - USD ($)
$ in Millions