CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL Statement (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended				6 Months Ended				6 Months Ended				6 Months Ended				6 Months Ended				6 Months Ended
	Jun. 30, 2013 Common Unit [Member]	Jun. 30, 2012 Common Unit [Member]	Dec. 31, 2012 Common Unit [Member]	Dec. 31, 2011 Common Unit [Member]	Jun. 30, 2013 Class B Units [Member]	Jun. 30, 2012 Class B Units [Member]	Dec. 31, 2012 Class B Units [Member]	Dec. 31, 2011 Class B Units [Member]	Jun. 30, 2013 i-units [Member]	Jun. 30, 2012 i-units [Member]	Dec. 31, 2012 i-units [Member]	Dec. 31, 2011 i-units [Member]	Jun. 30, 2013 General Partner [Member]	Jun. 30, 2012 General Partner [Member]	Dec. 31, 2012 General Partner [Member]	Dec. 31, 2011 General Partner [Member]	Jun. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Jun. 30, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2011 Accumulated Other Comprehensive Income (Loss) [Member]	Jun. 30, 2013 Noncontrolling Interest [Member]	Jun. 30, 2012 Noncontrolling Interest [Member]	Dec. 31, 2012 Noncontrolling Interest [Member]	Dec. 31, 2011 Noncontrolling Interest [Member]
Limited Partners' Capital Account, Units Outstanding	307,240,416	239,971,640	252,756,425	232,677,222	5,313,400	5,313,400	5,313,400	5,313,400	119,510,486	101,577,512	115,118,338	98,509,392
Limited Partners' Capital Account	$ 9,395	$ 4,170	$ 4,723	$ 4,347	$ 13	$ 24	$ 14	$ 42	$ 3,911	$ 2,772	$ 3,564	$ 2,857
Net Income (Loss) Attributable to Parent	659	(202)			13	(5)			274	(86)			837	631
Stock Issued During Period, Shares, Acquisitions	44,620,662	3,879,623
Stock Issued During Period, Value, Acquisitions	3,841	296
Stock Issued During Period, Shares, New Issues	9,863,329	3,414,795							860,600
Stock Issued During Period, Value, New Issues	834	277							73	0
Partners' Capital Account, Distributions	(662)	(551)			(14)	(13)			0	0			(792)	(630)
Partners' Capital, Other	0	3							0	1			2	1							0	4
Distribution Made to Member or Limited Partner, Share Distribution									3,531,548	3,068,120
General Partners' Capital Account													3,059	7,919	4,026	259
Increase to general partner's capital account as a result of drop-down transaction													(1,057)	7,658
Noncash compensation and severance expense allocated from KMI													5	0
Contributions from general partner													38	0
Accumulated Other Comprehensive Income (Loss), Net of Tax																	75	209	168	3
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax																	29	187			0	2
Stockholders' Equity Attributable to Noncontrolling Interest																					355	190	267	96
Net Income (Loss) Attributable to Noncontrolling Interest																					19	8
Derivative Instruments, Gain (Loss) Recognized in Income, Net																	(10)	20
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax																	(113)	(2)			(1)	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax																	1	1
Contributions from Noncontrolling Interests																					99	17
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders																					(19)	(15)
Change in noncontrolling interest resulting from drop-down acquisition																					$ (10)	$ 78