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Reportable Operating Segments and Geographic Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Non-interest revenues | $ 6,688 | $ 6,908 | $ 20,052 | $ 21,059
Interest income | 1,904 | 1,815 | 5,598 | 5,350
Interest expense | 399 | 420 | 1,223 | 1,302
Total revenues, net of interest expense | 8,193 | 8,303 | 24,427 | 25,107
Net income | 1,266 | 1,477 | 4,264 | 4,438
U S Card Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest revenues | 3,302 | 3,188 | 9,822 | 9,375
Interest income | 1,593 | 1,465 | 4,639 | 4,296
Interest expense | 166 | 152 | 481 | 455
Total revenues, net of interest expense | 4,729 | 4,501 | 13,980 | 13,216
Net income | 794 | 889 | 2,614 | 2,535
International Card Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest revenues | 1,071 | 1,206 | 3,214 | 3,571
Interest income | 226 | 273 | 706 | 825
Interest expense | 59 | 85 | 183 | 259
Total revenues, net of interest expense | 1,238 | 1,394 | 3,737 | 4,137
Net income | 89 | 142 | 348 | 378
Global Commercial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest revenues | 858 | 957 | 2,653 | 3,538
Interest income | 3 | 4 | 10 | 11
Interest expense | 44 | 61 | 138 | 186
Total revenues, net of interest expense | 817 | 900 | 2,525 | 3,363
Net income | 151 | 204 | 534 | 949
Global Network And Merchant Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest revenues | 1,302 | 1,368 | 3,898 | 4,027
Interest income | 26 | 14 | 69 | 35
Interest expense | (42) | (68) | (143) | (208)
Total revenues, net of interest expense | 1,370 | 1,450 | 4,110 | 4,270
Net income | 462 | 427 | 1,354 | 1,243
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest revenues | 155 | 189 | 465 | 548
Interest income | 56 | 59 | 174 | 183
Interest expense | 172 | 190 | 564 | 610
Total revenues, net of interest expense | 39 | 58 | 75 | 121
Net income | $ (230) | $ (185) | $ (586) | $ (667)

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