v3.25.2

Annual Total Returns	12 Months Ended
Annual Total Returns	Dec. 31, 2024
Federated Hermes Trust for U S Treasury Obligations \| SS
Prospectus [Line Items]
Annual Return [Percent]	4.86%

X

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 4
-Subsection b
-Paragraph 2
-Subparagraph ii

+ Details

Name:	oef_AnnlRtrPct
Namespace Prefix:	oef_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a

+ Details

Name:	oef_ProspectusLineItems
Namespace Prefix:	oef_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=mmot_S000009579Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	oef_ClassAxis=mmot_C000243030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: