Property, Plant and Equipment and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Intangible Assets [Member]	Mar. 31, 2014 Gathering Systems [Member] Minimum [Member]	Mar. 31, 2014 Gathering Systems [Member] Maximum [Member]	Mar. 31, 2014 Processing and Fractionation Facilities [Member] Minimum [Member]	Mar. 31, 2014 Processing and Fractionation Facilities [Member] Maximum [Member]	Mar. 31, 2014 Terminaling and Storage Facilities [Member] Minimum [Member]	Mar. 31, 2014 Terminaling and Storage Facilities [Member] Maximum [Member]	Mar. 31, 2014 Transportation Assets [Member] Minimum [Member]	Mar. 31, 2014 Transportation Assets [Member] Maximum [Member]	Mar. 31, 2014 Other Property, Plant and Equipment [Member] Minimum [Member]	Mar. 31, 2014 Other Property, Plant and Equipment [Member] Maximum [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member] Gathering Systems [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member] Gathering Systems [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member] Processing and Fractionation Facilities [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member] Processing and Fractionation Facilities [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member] Terminaling and Storage Facilities [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member] Terminaling and Storage Facilities [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member] Transportation Assets [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member] Transportation Assets [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member] Other Property, Plant and Equipment [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member] Other Property, Plant and Equipment [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member] Land [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member] Land [Member]	Mar. 31, 2014 Targa Resources Partners LP [Member] Construction in Progress [Member]	Dec. 31, 2013 Targa Resources Partners LP [Member] Construction in Progress [Member]	Mar. 31, 2014 TRC Non Partnership [Member]	Dec. 31, 2013 TRC Non Partnership [Member]	Mar. 31, 2014 TRC Non Partnership [Member] Gathering Systems [Member]	Dec. 31, 2013 TRC Non Partnership [Member] Gathering Systems [Member]	Mar. 31, 2014 TRC Non Partnership [Member] Processing and Fractionation Facilities [Member]	Dec. 31, 2013 TRC Non Partnership [Member] Processing and Fractionation Facilities [Member]	Mar. 31, 2014 TRC Non Partnership [Member] Terminaling and Storage Facilities [Member]	Dec. 31, 2013 TRC Non Partnership [Member] Terminaling and Storage Facilities [Member]	Mar. 31, 2014 TRC Non Partnership [Member] Transportation Assets [Member]	Dec. 31, 2013 TRC Non Partnership [Member] Transportation Assets [Member]	Mar. 31, 2014 TRC Non Partnership [Member] Other Property, Plant and Equipment [Member]	Dec. 31, 2013 TRC Non Partnership [Member] Other Property, Plant and Equipment [Member]	Mar. 31, 2014 TRC Non Partnership [Member] Land [Member]	Dec. 31, 2013 TRC Non Partnership [Member] Land [Member]	Mar. 31, 2014 TRC Non Partnership [Member] Construction in Progress [Member]	Dec. 31, 2013 TRC Non Partnership [Member] Construction in Progress [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member] Gathering Systems [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member] Gathering Systems [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member] Processing and Fractionation Facilities [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member] Processing and Fractionation Facilities [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member] Terminaling and Storage Facilities [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member] Terminaling and Storage Facilities [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member] Transportation Assets [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member] Transportation Assets [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member] Other Property, Plant and Equipment [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member] Other Property, Plant and Equipment [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member] Land [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member] Land [Member]	Mar. 31, 2014 Targa Resources Corp. Consolidated [Member] Construction in Progress [Member]	Dec. 31, 2013 Targa Resources Corp. Consolidated [Member] Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,936.9	$ 5,758.4												$ 5,930.1	$ 5,751.6	$ 2,293.6	$ 2,230.1	$ 1,600.7	$ 1,598.0	$ 735.4	$ 715.2	$ 334.7	$ 294.7	$ 124.8	$ 121.3	$ 89.7	$ 89.5	$ 751.2	$ 702.8	$ 6.8	$ 6.8	$ 0	$ 0	$ 6.6	$ 6.6	$ 0	$ 0	$ 0	$ 0	$ 0.2	$ 0.2	$ 0	$ 0	$ 0	$ 0	$ 5,936.9	$ 5,758.4	$ 2,293.6	$ 2,230.1	$ 1,607.3	$ 1,604.6	$ 735.4	$ 715.2	$ 334.7	$ 294.7	$ 125.0	$ 121.5	$ 89.7	$ 89.5	$ 751.2	$ 702.8
Accumulated depreciation	(1,472.6)	(1,408.5)												(1,470.3)	(1,406.2)															(2.3)	(2.3)															(1,472.6)	(1,408.5)
Property, plant and equipment, net	4,464.3	4,349.9												4,459.8	4,345.4															4.5	4.5															4,464.3	4,349.9
Intangible assets														681.8	681.8															0	0															681.8	681.8
Accumulated amortization														(43.7)	(28.4)															0	0															(43.7)	(28.4)
Intangible assets, net														$ 638.1	$ 653.4															$ 0	$ 0															$ 638.1	$ 653.4
Estimated useful life				5 years	20 years	5 years	25 years	5 years	25 years	10 years	25 years	3 years	25 years
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)			20 years