Risk Management Effect of Derivative Contracts on the Income Statement (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	$ (113,000,000)	$ 70,000,000	$ (169,000,000)	$ 29,000,000
Interest Rate Swap [Member] | Interest expense [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in income on derivative	63,000,000	(211,000,000)	124,000,000	(294,000,000)
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(6,000,000)	(2,000,000)	(12,000,000)	2,000,000
Gain to be reclassified within twelve months			71,000,000
Commodity Contract [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into income (effective portion)	(18,000,000)	3,000,000	(36,000,000)	10,000,000
Amount of gain/(loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	(27,000,000)	9,000,000	(32,000,000)	6,000,000
Commodity Contract [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	(113,000,000)	70,000,000	(169,000,000)	29,000,000
Commodity Contract [Member] | Interest expense [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in income on derivative	(63,000,000)	211,000,000	(124,000,000)	294,000,000
Commodity Contract [Member] | Revenues-Natural Gas Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(9,000,000)	0	(16,000,000)	0
Commodity Contract [Member] | Revenues-Natural Gas Sales [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into income (effective portion)	(2,000,000)	0	(12,000,000)	0
Amount of gain/(loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	0	0	0	0
Commodity Contract [Member] | Revenues-Product sales and other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	6,000,000	(1,000,000)	(1,000,000)	3,000,000
Commodity Contract [Member] | Revenues-Product sales and other [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into income (effective portion)	(23,000,000)	8,000,000	(32,000,000)	15,000,000
Amount of gain/(loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	(27,000,000)	9,000,000	(32,000,000)	6,000,000
Commodity Contract [Member] | Gas purchases and other costs of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(3,000,000)	(1,000,000)	7,000,000	(1,000,000)
Commodity Contract [Member] | Gas purchases and other costs of sales [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into income (effective portion)	7,000,000	(5,000,000)	8,000,000	(5,000,000)
Amount of gain/(loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	0	0	0	0
Commodity Contract [Member] | Other Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	0	(2,000,000)	0
Kinder Morgan Energy Partners, L.P. [Member] | 3.50% Senior Notes due March 1, 2021 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%		3.50%
Two notch credit downgrade [Member] | Kinder Morgan Energy Partners, L.P. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Additional Collateral, Aggregate Fair Value	$ 122,000,000		$ 122,000,000