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Other Assets (Details 2) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Components of other intangible assets |  |
Gross Carrying Amount | $ 2,105 | $ 1,885
Accumulated Amortization | (1,206) | (1,017)
Net Carrying Amount | 899 | 868
Customer Relationships [Member] |  |
Components of other intangible assets |  |
Gross Carrying Amount | 1,863 | 1,625
Accumulated Amortization | (1,073) | (895)
Net Carrying Amount | 790 | 730
Other Contracts [Member] |  |
Components of other intangible assets |  |
Gross Carrying Amount | 242 | 260
Accumulated Amortization | (133) | (122)
Net Carrying Amount | $ 109 | $ 138

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