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Other Assets (Details 2) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Components of other intangible assets |  |
Gross Carrying Amount | $ 1,885 | $ 1,737
Accumulated Amortization | (1,017) | (941)
Net Carrying Amount | 868 | 796
Customer Relationships [Member] |  |
Components of other intangible assets |  |
Gross Carrying Amount | 1,625 | 1,506
Accumulated Amortization | (895) | (836)
Net Carrying Amount | 730 | 670
Other Contracts [Member] |  |
Components of other intangible assets |  |
Gross Carrying Amount | 260 | 231
Accumulated Amortization | (122) | (105)
Net Carrying Amount | $ 138 | $ 126

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