Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Intangible assets with definite lives
Gross Carrying Amount	$ 79	$ 79
Accumulated Amortization	(65)	(61)
Net	14	18
Customer relationships
Intangible assets with definite lives
Gross Carrying Amount	70	70
Accumulated Amortization	(58)	(54)
Net	12	16
Other
Intangible assets with definite lives
Gross Carrying Amount	9	9
Accumulated Amortization	(7)	(7)
Net	$ 2	$ 2