Acquired Intangibles and Goodwill Acquired Intangibles (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Intangible Assets
Historical Cost	$ 1,388		$ 414
Accumulated Amortization	166		151
Net Book Value	1,222		263
Rockies Natural Gas Business customer relationships
Intangible Assets
Historical Cost	976	[1]	0	[1]
Accumulated Amortization	3	[1]	0	[1]
Net Book Value	973	[1]	0	[1]
Refining Operating permits and emissions credits
Intangible Assets
Historical Cost	279		279
Accumulated Amortization	116		107
Net Book Value	163		172
Retail supply network
Intangible Assets
Historical Cost	53		55
Accumulated Amortization	32		31
Net Book Value	21		24
Trade names
Intangible Assets
Historical Cost	49		49
Accumulated Amortization	13		12
Net Book Value	36		37
AMPM License
Intangible Assets
Historical Cost	31		31
Accumulated Amortization	2		1
Net Book Value	$ 29		$ 30

[1] In connection with the Rockies Natural Gas Business acquisition, TLLP recognized $976 million of customer relationships associated with the acquired natural gas processing and gathering operations. The value for the identified customer relationships consists of cash flows expected from existing contracts and future arrangements from the existing customer base.The amounts and useful lives associated with these customer relationships remain preliminary and subject to revision within TLLP’s measurement period of the purchase price allocation.