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Non-Interest Revenue and Expense Detail (Tables) | 12 Months Ended
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Dec. 31, 2017
Table Text Block [Abstract] |
Details of other commissions and fees | The following is a detail of Other fee s and commissions for the years ended December 31:
(Millions) |  | 2017 |  | 2016 |  | 2015
Delinquency fees |  | $ | 888 |  | $ | 762 |  | $ | 788
Foreign currency conversion fee revenue |  |  | 851 |  |  | 809 |  |  | 852
Loyalty coalition-related fees |  |  | 453 |  |  | 410 |  |  | 379
Travel commissions and fees |  |  | 354 |  |  | 338 |  |  | 349
Service fees |  |  | 309 |  |  | 291 |  |  | 361
Other(a) |  |  | 167 |  |  | 143 |  |  | 137
| Total Other fees and commissions |  | $ | 3,022 |  | $ | 2,753 |  | $ | 2,866
Other primarily includes fees related to Membership Rewards programs.
(Millions) |  | 2016 |  | 2015 |  | 2014
Foreign currency conversion fee revenue |  | $ | - |  | $ | 852 |  | $ | 877
Delinquency fees |  |  | - |  |  | 788 |  |  | 722
Loyalty coalition-related fees |  |  | - |  |  | 379 |  |  | 383
Travel commissions and fees |  |  | - |  |  | 349 |  |  | 1,118
Service fees |  |  | - |  |  | 361 |  |  | 366
Other(a) |  |  | - |  |  | 137 |  |  | 160
| Total Other fees and commissions |  | $ | - |  | $ | 2,866 |  | $ | 3,626
Details of other revenues | The following is a detail of Other revenues for the years ended December 31:
(Millions) |  | 2017 |  | 2016 |  | 2015
Global Network Services partner revenues |  | $ | 615 |  | $ | 654 |  | $ | 640
Other(a) |  |  | 1,117 |  |  | 1,375 |  |  | 1,393
| Total Other revenues |  | $ | 1,732 |  | $ | 2,029 |  | $ | 2,033
Other includes revenues arising from net revenue earned on cross-border Card Member spending, insurance premiums earned from Card Member travel and other insurance programs, merchant-related fees, Prepaid card and Travelers Cheque-related revenues, revenues related to the GBT JV transition services agreemen t, earnings from equity method investments (including the GBT JV) and other miscellaneous revenue and fees.
Detail of other, net expense | The following is a detail of Other expenses for the years ended December 31:
(Millions) |  | 2017 |  | 2016 |  | 2015
Professional services |  | $ | 2,070 |  | $ | 2,583 |  | $ | 2,750
Occupancy and equipment |  |  | 2,019 |  |  | 1,838 |  |  | 1,854
Communications |  |  | 276 |  |  | 302 |  |  | 345
Gain on sale of HFS portfolios(a) |  |  | ― |  |  | (1,218) |  |  | ―
Other(b) |  |  | 1,411 |  |  | 1,657 |  |  | 1,844
| Total Other expenses |  | $ | 5,776 |  | $ | 5,162 |  | $ | 6,793
Refer to Note 2 for additional information. Other expense primarily inclu des general operating expenses, goodwill and technology impairment costs (refer to Note 2), Card and merchant-related fraud losses, foreign cu rrency-related gains and losses (including the favorable impact from the reassessment of the functional currency of certain UK legal entities in the year ended December 31, 2015) and insurance costs. In addition, b eginning December 1, 2015 through to the po rtfolio sale completion dates, i nclude d the valuation allowance adjustment associated with the HFS portfolios.

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