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Revenue (Contract Liabilities) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Change In Contract With Customer, Liability [Roll Forward]
Beginning Balance	$ 32
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	5
Revenue recognized that was included in the balance at the beginning of the period	(1)
Ending Balance	$ 36

X

- Definition

Change In Contract With Customer, Liability

+ References

No definition available.

+ Details

Name:	dtm_ChangeInContractWithCustomerLiabilityRollForward
Namespace Prefix:	dtm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Increase From Cash Receipts

+ References

No definition available.

+ Details

Name:	dtm_ContractWithCustomerLiabilityIncreaseFromCashReceipts
Namespace Prefix:	dtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration