Guarantee of Securities of Subsidiaries Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 185	$ 3,280	$ 264	$ 684
Other current assets - affiliates	0	2
All other current assets	279	248
Property, plant and equipment, net	36,419	37,897
Investments	7,759	7,481
Goodwill	21,451	21,965	22,162
Deferred income taxes	857	1,566
Other non-current assets	1,757	1,355
Total Assets	74,157	78,866
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Long-term debt	31,915	33,936
Notes payable to affiliates	41	34
Total Liabilities	39,268	43,669
Redeemable Noncontrolling Interest	803	666
Total KMI equity	33,742	33,678
Noncontrolling interests	344	853
Total Stockholders’ Equity	34,086	34,531	$ 35,124	$ 34,802
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity	74,157	78,866
Parent Issuer and Guarantor
ASSETS
Cash and cash equivalents	2	8
Other current assets - affiliates	5,249	4,465
All other current assets	105	171
Property, plant and equipment, net	218	231
Investments	664	664
Investments in subsidiaries	46,873	42,096
Goodwill	13,721	13,789
Notes receivable from affiliates	912	945
Deferred income taxes	2,495	3,137
Other non-current assets	677	233
Total Assets	70,916	65,739
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Current portion of debt	386	1,933
Other current liabilities - affiliates	20,329	14,189
All other current liabilities	520	486
Long-term debt	13,239	13,474
Notes payable to affiliates	1,693	1,234
Deferred income taxes	0	0
Other long-term liabilities and deferred credits	1,007	745
Total Liabilities	37,174	32,061
Redeemable Noncontrolling Interest	0	0
Total KMI equity	33,742	33,678
Noncontrolling interests	0	0
Total Stockholders’ Equity	33,742	33,678
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity	70,916	65,739
Subsidiary Issuer and Guarantor - KMP
ASSETS
Cash and cash equivalents	0	0
Other current assets - affiliates	4,497	4,788
All other current assets	39	17
Property, plant and equipment, net	0	0
Investments	0	0
Investments in subsidiaries	44,485	40,049
Goodwill	22	22
Notes receivable from affiliates	20,323	20,345
Deferred income taxes	0	0
Other non-current assets	223	105
Total Assets	69,589	65,326
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Current portion of debt	1,835	1,300
Other current liabilities - affiliates	14,247	14,087
All other current liabilities	323	354
Long-term debt	15,134	16,799
Notes payable to affiliates	448	448
Deferred income taxes	0	0
Other long-term liabilities and deferred credits	28	59
Total Liabilities	32,015	33,047
Redeemable Noncontrolling Interest	0	0
Total KMI equity	37,574	32,279
Noncontrolling interests	0	0
Total Stockholders’ Equity	37,574	32,279
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity	69,589	65,326
Subsidiary Guarantors
ASSETS
Cash and cash equivalents	0	0
Other current assets - affiliates	30,565	23,851
All other current assets	1,820	2,056
Property, plant and equipment, net	29,997	30,750
Investments	7,004	6,718
Investments in subsidiaries	5,221	6,077
Goodwill	5,167	5,166
Notes receivable from affiliates	453	247
Deferred income taxes	0	0
Other non-current assets	3,820	3,823
Total Assets	84,047	78,688
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Current portion of debt	30	30
Other current liabilities - affiliates	5,744	4,898
All other current liabilities	1,507	1,838
Long-term debt	3,000	3,020
Notes payable to affiliates	20,517	20,543
Deferred income taxes	625	503
Other long-term liabilities and deferred credits	1,203	944
Total Liabilities	32,626	31,776
Redeemable Noncontrolling Interest	803	666
Total KMI equity	50,618	46,246
Noncontrolling interests	0	0
Total Stockholders’ Equity	50,618	46,246
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity	84,047	78,688
Subsidiary Non-Guarantors
ASSETS
Cash and cash equivalents	183	3,277
Other current assets - affiliates	1,105	1,031
All other current assets	1,106	212
Property, plant and equipment, net	6,204	6,916
Investments	91	99
Investments in subsidiaries	4,449	4,324
Goodwill	2,541	2,988
Notes receivable from affiliates	1,325	1,043
Deferred income taxes	0	0
Other non-current assets	96	74
Total Assets	17,100	19,964
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Current portion of debt	226	125
Other current liabilities - affiliates	1,096	961
All other current liabilities	300	1,510
Long-term debt	542	643
Notes payable to affiliates	355	355
Deferred income taxes	1,013	1,068
Other long-term liabilities and deferred credits	388	428
Total Liabilities	3,920	5,090
Redeemable Noncontrolling Interest	0	0
Total KMI equity	13,180	14,874
Noncontrolling interests	0	0
Total Stockholders’ Equity	13,180	14,874
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity	17,100	19,964
Consolidated KMI
ASSETS
Cash and cash equivalents	185	3,280
Other current assets - affiliates	0	0
All other current assets	3,053	2,442
Property, plant and equipment, net	36,419	37,897
Investments	7,759	7,481
Investments in subsidiaries	0	0
Goodwill	21,451	21,965
Notes receivable from affiliates	0	0
Deferred income taxes	857	1,566
Other non-current assets	4,433	4,235
Total Assets	74,157	78,866
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Current portion of debt	2,477	3,388
Other current liabilities - affiliates	0	0
All other current liabilities	2,623	4,169
Long-term debt	31,915	33,936
Notes payable to affiliates	0	0
Deferred income taxes	0	0
Other long-term liabilities and deferred credits	2,253	2,176
Total Liabilities	39,268	43,669
Redeemable Noncontrolling Interest	803	666
Total KMI equity	33,742	33,678
Noncontrolling interests	344	853
Total Stockholders’ Equity	34,086	34,531
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity	74,157	78,866
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	(5)
Other current assets - affiliates	(41,416)	(34,135)
All other current assets	(17)	(14)
Property, plant and equipment, net	0	0
Investments	0	0
Investments in subsidiaries	(101,028)	(92,546)
Goodwill	0	0
Notes receivable from affiliates	(23,013)	(22,580)
Deferred income taxes	(1,638)	(1,571)
Other non-current assets	(383)	0
Total Assets	(167,495)	(150,851)
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Current portion of debt	0	0
Other current liabilities - affiliates	(41,416)	(34,135)
All other current liabilities	(27)	(19)
Long-term debt	0	0
Notes payable to affiliates	(23,013)	(22,580)
Deferred income taxes	(1,638)	(1,571)
Other long-term liabilities and deferred credits	(373)	0
Total Liabilities	(66,467)	(58,305)
Redeemable Noncontrolling Interest	0	0
Total KMI equity	(101,372)	(93,399)
Noncontrolling interests	344	853
Total Stockholders’ Equity	(101,028)	(92,546)
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity	$ (167,495)	$ (150,851)