XML 54 R47.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Composite depreciation rate, low	1.01%
Composite depreciation rate, high	23.00%

X

- Definition

Composite depreciation rate, high

+ References

No definition available.

+ Details

Name:	kmi_CompositeDepreciationRateHigh
Namespace Prefix:	kmi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Composite depreciation rate, low

+ References

No definition available.

+ Details

Name:	kmi_CompositeDepreciationRateLow
Namespace Prefix:	kmi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration