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Other Assets (Details 2) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Components of other intangible assets |  |
Gross Carrying Amount | $ 1,737 | $ 1,710
Accumulated Amortization | (941) | (856)
Net Carrying Amount | 796 | 854
Other Contracts [Member] |  |
Components of other intangible assets |  |
Gross Carrying Amount | 231 | 255
Accumulated Amortization | (105) | (102)
Customer Relationships [Member] |  |
Components of other intangible assets |  |
Gross Carrying Amount | 1,506 | 1,455
Accumulated Amortization | $ (836) | $ (754)

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- Definition Amount before 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 + Details
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