Other Assets (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Components of other intangible assets
Gross Carrying Amount	$ 1,710	$ 1,566
Accumulated Amortization	(856)	(749)
Net Carrying Amount	854us-gaap_FiniteLivedIntangibleAssetsNet	817us-gaap_FiniteLivedIntangibleAssetsNet
Other Contracts [Member]
Components of other intangible assets
Gross Carrying Amount	255	269
Accumulated Amortization	(102)	(89)
Net Carrying Amount	153	180
Customer Relationships [Member]
Components of other intangible assets
Gross Carrying Amount	1,455	1,297
Accumulated Amortization	(754)	(660)
Net Carrying Amount	$ 701	$ 637

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

+ References

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=26713463&loc=d3e16323-109275

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

+ References

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

+ References

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