Debt Current Portion of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Current portion of debt	$ 2,477	$ 3,388
Debt, Weighted Average Interest Rate	5.27%	5.15%
Commercial Paper
Debt Instrument [Line Items]
Current portion of debt	$ 37	$ 433
Debt, Weighted Average Interest Rate	1.90%	3.10%
$500 million, 364-day credit facility due November 15, 2019
Debt Instrument [Line Items]
Current portion of debt	$ 0	$ 0
$4 billion credit facility due November 16, 2023
Debt Instrument [Line Items]
Current portion of debt	0	0
9.00%, due February 2019
Debt Instrument [Line Items]
Current portion of debt	$ 0	$ 500
Debt Instrument, Interest Rate, Stated Percentage		9.00%
2.65%, due February 2019
Debt Instrument [Line Items]
Current portion of debt	$ 0	$ 800
Debt Instrument, Interest Rate, Stated Percentage		2.65%
3.05%, due December 2019
Debt Instrument [Line Items]
Current portion of debt	$ 0	$ 1,500
Debt Instrument, Interest Rate, Stated Percentage		3.05%
6.85%, due February 2020
Debt Instrument [Line Items]
Current portion of debt	$ 700	$ 0
Debt Instrument, Interest Rate, Stated Percentage	6.85%	6.85%
6.50%, due April 2020
Debt Instrument [Line Items]
Current portion of debt	$ 535	$ 0
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
5.30%, due September 2020
Debt Instrument [Line Items]
Current portion of debt	$ 600	$ 0
Debt Instrument, Interest Rate, Stated Percentage	5.30%	5.30%
6.50%, due September 2020
Debt Instrument [Line Items]
Current portion of debt	$ 349	$ 0
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
Trust I Preferred Securities, 4.75%, due March 2028(b) | Capital Trust I
Debt Instrument [Line Items]
Current portion of debt	$ 111	$ 111
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%
KMGP, $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock, due August 2057 | Kinder Morgan G.P., Inc.
Debt Instrument [Line Items]
Current portion of debt	$ 100	$ 0
Other debt
Debt Instrument [Line Items]
Current portion of debt	$ 45	$ 44