| Document and Entity Information | Jul. 21, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 21, 2021 |
| Entity Registrant Name | KINDER MORGAN, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35081 |
| Entity Tax Identification Number | 80-0682103 |
| Entity Address, Address Line One | 1001 Louisiana Street |
| Entity Address, Address Line Two | Suite 1000 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77002 |
| City Area Code | 713 |
| Local Phone Number | 369-9000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001506307 |
| Amendment Flag | false |
| Class P | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class P Common Stock |
| Trading Symbol | KMI |
| Security Exchange Name | NYSE |
| KMI 1.50% Senior Notes Due 2022 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 1.500% Senior Notes due 2022 |
| Trading Symbol | KMI 22 |
| Security Exchange Name | NYSE |
| 2.25%, Due March 2027 Notes | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 2.250% Senior Notes due 2027 |
| Trading Symbol | KMI 27 A |
| Security Exchange Name | NYSE |
