The CEO also said it's OK for a bank to fail if contagion to other lenders can be prevented.
The investigation found that the brokerage had deficiencies in many parts of its operations.
“We should never question the creditworthiness of the US government," he said.
Top managers have been asked to identify potential cost-reduction targets.
The move builds on the existing credit-card partnership between the two companies.
The tone contrasts with Friday's jobs report showing bigger-than-expected payroll gains.
The Russian invasion of Ukraine and the Federal Reserve's policy have created storm clouds, Dimon said.
Global investment banks are broadly falling into two camps on their approach to flexible-work policies.
The takeover adds E*Trade’s $360 billion of client assets to Morgan Stanley’s $2.7 trillion.
Automation and technology are replacing thousands of workers at banks and asset managers around the world.