Equity, Equity Activity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Changes in carrying amount of Equity
Balance at December 31, 2014	$ 1,890
Equity offering under ATM Program, net of issuance costs	24
Distributions	(79)	[1]
Net income	74		42	[2]
Contributions	5	[3]
Other	1
Balance at March 31, 2015	1,915
Common
Changes in carrying amount of Equity
Balance at December 31, 2014	1,474
Equity offering under ATM Program, net of issuance costs	24
Distributions	(54)	[1]
Net income	50
Contributions	5	[3]
Other	1
Balance at March 31, 2015	1,500
General Partner
Changes in carrying amount of Equity
Balance at December 31, 2014	(19)
Equity offering under ATM Program, net of issuance costs	0
Distributions	(16)	[1]
Net income	14
Contributions	0	[3]
Other	0
Balance at March 31, 2015	(21)
Noncontrolling Interest
Changes in carrying amount of Equity
Balance at December 31, 2014	435
Equity offering under ATM Program, net of issuance costs	0
Distributions	(9)	[1]
Net income	10
Contributions	0	[3]
Other	0
Balance at March 31, 2015	436
Green River Processing, LLC
Changes in carrying amount of Equity
Balance at December 31, 2014	280
Distributions	(17)
Net income	10		14
Contributions	6
Balance at March 31, 2015	279
Green River Processing, LLC | QEPFS
Changes in carrying amount of Equity
Balance at December 31, 2014	168
Distributions	(10)
Net income	6
Contributions	4
Balance at March 31, 2015	168
Limited partnership ownership interest	60.00%
Green River Processing, LLC | QEP Midstream Operating, LLC
Changes in carrying amount of Equity
Balance at December 31, 2014	112
Distributions	(7)
Net income	4
Contributions	2
Balance at March 31, 2015	$ 111
Ownership interest	40.00%

[1] Represents cash distributions declared and paid during the period ended March 31, 2015 relating to the fourth quarter of 2014.

[2] Adjusted to include the historical results of the West Coast Logistics Assets. See Notes 1 and 2 for further discussion.

[3] Includes Tesoro and TLGP contributions to the Partnership primarily related to reimbursements for capital spending pursuant to the Amended Omnibus Agreement.