Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Intangible assets with definite lives
Gross Carrying Amount	$ 79	$ 79
Accumulated Amortization	(73)	(69)
Net	6	10
Customer relationships
Intangible assets with definite lives
Gross Carrying Amount	70	70
Accumulated Amortization	(65)	(61)
Net	5	9
Other
Intangible assets with definite lives
Gross Carrying Amount	9	9
Accumulated Amortization	(8)	(8)
Net	$ 1	$ 1

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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