Debt Guarantees (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Kinder Morgan Energy Partners, L.P. | Payment Guarantee
Guarantor Obligations [Line Items]
BNSF Ownership Percentage	0.50%
Principal Amount Guaranteed	$ 190
Maximum Future Payments	190
Maximum Recourse Amount	0	[1]
Capitalized Obligations	2	[2]
Chevron Phillips Chemical Company, LP | Indemnification Agreement
Guarantor Obligations [Line Items]
BNSF Ownership Percentage	0.00%
Remaining Term (in years)	4 years
Capitalized Obligations	$ 7	[3]

[1] Reflects the maximum amount the Company could recover from a third party other than the counterparty.

[2] Reflects capitalized obligations that are recorded on the Company’s Consolidated Balance Sheet.

[3] Reflects the asset and corresponding liability for the fair value of these guarantees required by authoritative accounting guidance related to guarantees.