Loans - Contractual Maturities (Details) - USD ($) $ in Millions		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017		$ 21,225
2018		11,018
2019		9,569
2020		7,545
2021		5,313
Thereafter		19,205
Total loans		73,875		$ 82,917		$ 77,741
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		54,216		62,453
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		19,659		20,464
Construction and Other Real Estate [Member] | Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017		4,041
2018		1,857
2019		1,775
2020		1,397
2021		958
Thereafter		862
Total loans		10,890		10,000		10,300
Business and Corporate Banking [Member] | Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017		5,225
2018		2,402
2019		2,294
2020		1,806
2021		1,238
Thereafter		1,115
Total loans	[1]	14,080		14,365		13,878
Global Banking [Member] | Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017		9,927
2018		4,565
2019		4,360
2020		3,431
2021		2,353
Thereafter		2,119
Total loans	[1]	26,755	[2]	34,720	[2]	30,328
Other Commercial [Member] | Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017		924
2018		425
2019		406
2020		319
2021		219
Thereafter		198
Total loans		2,491		3,368		3,581
Residential Mortgage [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017		663
2018		430
2019		471
2020		432
2021		444
Thereafter		14,741
Total loans		17,181	[3],[4]	17,758		16,661
Home Equity Mortgages [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017	[5]	283
2018	[5]	433
2019	[5]	262
2020	[5]	159
2021	[5]	101
Thereafter	[5]	170
Total loans		1,408	[5]	1,600		1,784
Credit Cards [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017	[6]	0
2018	[6]	688
2019	[6]	0
2020	[6]	0
2021	[6]	0
Thereafter	[6]	0
Total loans		688	[6]	699		720
Other consumer | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017		162
2018		218
2019		1
2020		1
2021		0
Thereafter		0
Total loans		$ 382		$ 407		$ 489

[1] During the fourth quarter of 2016, we transferred certain customer relationships from CMB to GB&M as discussed further in Note 22, "Business Segments," in the accompanying consolidated financial statements. As a result, we reclassified $4.8 billion, $3.9 billion and $3.4 billion of loans and $27 million, $24 million and $7 million of allowance for credit losses from business and corporate banking to global banking at December 31, 2015, 2014 and 2013, respectively, to conform with the current year presentation.

[2] Represents large multinational firms including globally focused U.S. corporate and financial institutions, U.S. dollar lending to multinational banking customers managed by HSBC on a global basis and complex large business customers supported by GB&M relationship managers. Also includes loans to HSBC affiliates which totaled $3,274 million and $4,815 million at December 31, 2016 and 2015, respectively. See Note 21, "Related Party Transactions," for additional information regarding loans to HSBC affiliates.

[3] The decrease in nonaccrual loans at December 31, 2016 reflects the impact of transfers of certain residential mortgage loans to held for sale during 2016.

[4] The decrease in past due loans at December 31, 2016 reflects the impact of transfers of certain residential mortgage loans to held for sale during 2016. See Note 7, "Loans Held for Sale" for additional details.

[5] Home equity mortgage maturities reflect estimates based on historical payment patterns.

[6] As credit card receivables do not have stated maturities, the table reflects estimates based on historical payment patterns.