Litigation (Details 1) $ in Thousands, € in Millions, £ in Millions, SFr in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)
Mozambique matter \| US Department of Justice (DOJ) and Securities and Exchange Commission (SEC)
Litigation disclosures
of which fines	$ 275,000
Mozambique matter \| US District Court for the Eastern District of New York (EDNY) \| Penalty, final [Member]
Litigation disclosures
of which restitution	22,600
Mozambique matter \| UK Financial Services Authority
Litigation disclosures
Debt Relief	200,000
Mozambique matter \| UK Financial Services Authority \| Penalty, basic [Member] \| Minimum
Litigation disclosures
Loss contingency, damages paid, value	$ 200,000
Credit Suisse Securities (USA) LLC \| Mortgage-related matters - Government and regulatory related \| United States Department of Justice (DOJ)
Litigation disclosures
Litigation, Increase of Consumer Relief per Annum	5.00%	5.00%	5.00%	5.00%
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Loan Trust Series 2006-HE7 \| New York state court \| Minimum
Litigation disclosures
Estimated damages	$ 374,000
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Litigation, Plaintiff, CSMC Asset-Backed Trust 2007-NC1 \| New York state court \| Minimum
Litigation disclosures
Estimated damages	0
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Asset Trust Series 2006-8 \| New York state court \| Minimum
Litigation disclosures
Estimated damages	436,000
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Asset Trust Series 2007-1 \| New York state court \| Minimum
Litigation disclosures
Estimated damages	420,000
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Asset Trust Series 2007-2 \| New York state court \| Minimum
Litigation disclosures
Estimated damages	495,000
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Asset Trust Series 2007-3 \| Minnesota state court \| Minimum
Litigation disclosures
Estimated damages	206,000
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Mortgage Trust Series 2006-5 \| New York state court \| Minimum
Litigation disclosures
Estimated damages	500,000
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Mortgage Trust Series 2006-1, 2006-3 and 2006-4 \| New York state court \| Minimum
Litigation disclosures
Estimated damages	730,000
DLJ Mortgage Capital, Inc. \| Mortgage-related matters - Repurchase litigations \| Home Equity Mortgage Trust Series 2006-1, 2006-3, 2006-4 and 2006-5 \| New York state court
Litigation disclosures
Litigation Settlement, Amount Awarded to Other Party	500,000
Credit Suisse AG and certain affiliates \| Mortgage-related matters \| Litigation, Plaintiff, Loreley \| English Court \| Minimum
Litigation disclosures
Estimated damages	100,000
Credit Suisse Securities LLC and certain of its affiliates \| Bank loan litigation \| Highland Capital Management LP \| Texas State Court \| Original [Member]
Litigation disclosures
Litigation Settlement, Amount Awarded to Other Party	287,000
Credit Suisse Securities LLC and certain of its affiliates \| Bank loan litigation \| Highland Capital Management LP \| Texas State Court \| Revised [Member]
Litigation disclosures
Litigation Settlement, Amount Awarded to Other Party	121,000
Credit Suisse Securities LLC and certain of its affiliates \| Bank loan litigation \| Highland Capital Management LP \| Texas supreme court \| Reversed [Member]
Litigation disclosures
Litigation Settlement, Amount Awarded to Other Party	212,000
Credit Suisse Group AG, Credit Suisse AG, Credit Suisse Securities (Europe) Limited \| Rates Related Matters - regulatory matters - foreign exchange trading business \| European Commission
Litigation disclosures
of which fines \| €		€ 83.3
Credit Suisse Group AG, Credit Suisse Securities (Europe) Limited \| Rates Related Matters - regulatory matters - SSA bonds trading business \| European Commission
Litigation disclosures
of which fines \| €		€ 11.9
Credit Suisse Life Bermuda Ltd [Member] \| Customer acount matters, against former relationship manager \| Supreme Court of Bermuda
Litigation disclosures
Estimated damages	$ 536,640				$ 607,350
Bermuda Statutory Rate Of Interest	3.50%	3.50%	3.50%	3.50%
Credit Suisse Life Bermuda Ltd [Member] \| Customer acount matters, against former relationship manager \| Supreme Court of Bermuda \| Minimum
Litigation disclosures
Loss contingency, damages paid, value	$ 75,000
Credit Suisse Trust Limited, a Credit Suisse AG affiliate [Member] \| Customer acount matters, against former relationship manager \| Signapore International Commercial Court
Litigation disclosures
Estimated damages	742,730
UBS Group, Credit Suisse AG, Credit Suisse Holdings (USA) and Credit Suisse AG, New York Branch \| Archegos Capital Management \| Board of Governors of the Federal Reserve System (Fed) \| Penalty, final [Member]
Litigation disclosures
of which fines	269,000
Credit Suisse International and Credit Suisse Securities (Europe) Limited \| Archegos Capital Management \| Prudential Regulation Authority (PRA) \| Penalty, final [Member]
Litigation disclosures
of which fines \| £				£ 87
Credit Suisse AG \| Customer acount matters, against former relationship manager \| Geneva Prosecutor's Office
Litigation disclosures
Estimated damages	$ 130,000
Credit Suisse AG \| Litigation Bulgarian former clients matter \| Swiss Federal Criminal Court
Litigation disclosures
Estimated damages \| SFr			SFr 19
of which fines \| SFr			2
Seized client assets \| SFr			SFr 12