Related Party Transactions (Details) (Targa Resource Partners, L.P., USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Targa Resource Partners, L.P.
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 12,200,000	$ 14,200,000
Accounts Payable, Related Parties	$ 0		$ 0