13. Non-Interest Revenue and Expense Detail

The following is a detail of Other fees and commissions:

			Three Months Ended				Six Months Ended
			June 30,				June 30,
(Millions)		2016		2015		2016		2015
Foreign currency conversion fee revenue		$	207	$	222	$	403	$	433
Delinquency fees			192		194		392		389
Loyalty coalition-related fees			104		88		198		179
Travel commissions and fees			87		95		167		184
Service fees			79		95		157		182
Other^(a)			33		33		65		68
	Total Other fees and commissions	$	702	$	727	$	1,382	$	1,435

Other primarily includes revenues from fees related to Membership Rewards programs.

The following is a detail of Other revenues:

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(Millions)		2016		2015		2016		2015
Global Network Services partner revenues		$	197	$	155	$	342	$	318
Gross realized gains on sale of investment securities			―		―		4		―
Other^(a)			348		366		685		671
	Total Other revenues	$	545	$	521	$	1,031	$	989

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, Travelers Cheques-related revenues, revenues related to the GBT JV transition services agreement, earnings from equity method investments (including the GBT JV) and other miscellaneous revenue and fees.

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Millions)	2016		2015		2016		2015
Professional services	$	628	$	655	$	1,232	$	1,279
Occupancy and equipment		438		415		903		849
Communications		80		85		163		173
Card and merchant-related fraud losses		57		83		115		183
Gain on sale of HFS portfolios^(a)		(1,091)		―		(1,218)		―
Other^(b)		358		297		695		450
Total Other expenses	$	470	$	1,535	$	1,890	$	2,934

Refer to Note 2 for additional information.
Other expense includes general operating expenses, gains and losses on sale of assets or businesses not classified as discontinued operations, litigation, certain internal and regulatory review-related reimbursements and insurance costs or settlements, certain loyalty coalition-related expenses, the valuation allowance adjustment associated with loans and receivables HFS (refer to Note 2), and foreign currency-related gains and losses (including the favorable impact from the reassessment of the functional currency of certain UK legal entities in prior year).