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Non-Interest Revenue and Expense Detail (Tables) | 6 Months Ended
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Jun. 30, 2018
Other Cost And Expense Disclosure Operating (Tables) [Abstract] |
Details of other commissions and fees | The following is a detail of Other fees and commissions:
|  |  |  |  | Three Months Ended |  |  | Six Months Ended
|  |  |  |  | June 30, |  |  | June 30,
(Millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Fees charged to Card Members: |  |  |  |  |  |  |  |  |  |  |  |
| Delinquency fees |  | $ | 232 |  | $ | 218 |  | $ | 474 |  | $ | 432
| Foreign currency conversion fee revenue |  |  | 233 |  |  | 212 |  |  | 458 |  |  | 411
Other customer fees: |  |  |  |  |  |  |  |  |  |  |  |
| Loyalty coalition-related fees |  |  | 107 |  |  | 114 |  |  | 218 |  |  | 216
| Travel commissions and fees |  |  | 112 |  |  | 92 |  |  | 211 |  |  | 182
| Service fees and other(a) |  |  | 102 |  |  | 110 |  |  | 206 |  |  | 216
| Total Other fees and commissions |  | $ | 786 |  | $ | 746 |  | $ | 1,567 |  | $ | 1,457
Other includes Membership Rewards program fees that are not related to contracts with customers.
Details of other revenues | The following is a detail of Other revenues:
|  |  |  | Three Months Ended |  | Six Months Ended
|  |  |  | June 30, |  | June 30,
(Millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Global Network Services partner revenues |  | $ | 66 |  | $ | 88 |  | $ | 145 |  | $ | 179
Other(a) |  |  | 283 |  |  | 291 |  |  | 581 |  |  | 561
| Total Other revenues |  | $ | 349 |  | $ | 379 |  | $ | 726 |  | $ | 740
Other includes revenues arising from net revenue earned on cross-border Card Member spending, merchant-related fees, insurance premiums earned from Card Member travel and other insurance programs, prepaid card and Travelers Cheque-related revenues, 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:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(Millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Occupancy and equipment |  | $ | 484 |  | $ | 484 |  | $ | 1,004 |  | $ | 958
Professional services |  |  | 508 |  |  | 511 |  |  | 965 |  |  | 1,012
Other(a) |  |  | 321 |  |  | 351 |  |  | 778 |  |  | 746
Total Other expenses |  | $ | 1,313 |  | $ | 1,346 |  | $ | 2,747 |  | $ | 2,716
For the six months ended June 30, 2018, other expense includes the loss on a transaction involving the operations of our prepaid reloadable and gift card business and gains on the re-measurement of certain equity investments previously carried at cost. For all periods, other expense also includes general operating expenses, communication expenses, Card and merchant-related fraud losses, foreign currency-related gains and losses and insurance costs.

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