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Reportable Operating Segments and Geographic Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest revenues |  |  |  |  |  |  |  |  | $ 27,030 | $ 26,348 | $ 26,896
Interest income |  |  |  |  |  |  |  |  | 8,553 | 7,475 | 7,545
Interest expense |  |  |  |  |  |  |  |  | 2,112 | 1,704 | 1,623
Total revenues, net of interest expense | $ 8,839 | $ 8,436 | $ 8,307 | $ 7,889 | $ 8,022 | $ 7,774 | $ 8,235 | $ 8,088 | 33,471 | 32,119 | 32,818
Total provision |  |  |  |  |  |  |  |  | 2,759 | 2,026 | 1,988
Pretax income | 1,821 | $ 1,827 | $ 1,949 | $ 1,817 | 1,161 | $ 1,735 | $ 3,016 | $ 2,184 | 7,414 | 8,096 | 7,938
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 4,678 | 2,688 | 2,775
Net Income from continuing operations |  |  |  |  |  |  |  |  | 2,736 | 5,408 | 5,163
Total assets | 181,159 |  |  |  | 158,893 |  |  |  | 181,159 | 158,893 | 161,000
U S Consumer Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest revenues |  |  |  |  |  |  |  |  | 7,923 | 7,874 | 8,479
Interest income |  |  |  |  |  |  |  |  | 5,755 | 5,082 | 5,198
Interest expense |  |  |  |  |  |  |  |  | 742 | 536 | 488
Total revenues, net of interest expense |  |  |  |  |  |  |  |  | 12,936 | 12,420 | 13,189
Total provision |  |  |  |  |  |  |  |  | 1,630 | 1,065 | 1,064
Pretax income |  |  |  |  |  |  |  |  | 2,803 | 3,881 | 3,677
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 912 | 1,368 | 1,322
Net Income from continuing operations |  |  |  |  |  |  |  |  | 1,891 | 2,513 | 2,355
Total assets | 94,200 |  |  |  | 87,400 |  |  |  | 94,200 | 87,400 | 92,700
International Consumer and Network Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest revenues |  |  |  |  |  |  |  |  | 5,052 | 4,785 | 4,627
Interest income |  |  |  |  |  |  |  |  | 1,029 | 922 | 945
Interest expense |  |  |  |  |  |  |  |  | 251 | 219 | 235
Total revenues, net of interest expense |  |  |  |  |  |  |  |  | 5,830 | 5,488 | 5,337
Total provision |  |  |  |  |  |  |  |  | 367 | 325 | 300
Pretax income |  |  |  |  |  |  |  |  | 1,093 | 818 | 904
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 181 | 163 | 220
Net Income from continuing operations |  |  |  |  |  |  |  |  | 912 | 655 | 684
Total assets | 38,900 |  |  |  | 35,700 |  |  |  | 38,900 | 35,700 | 35,100
Global Commercial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest revenues |  |  |  |  |  |  |  |  | 9,463 | 9,007 | 8,930
Interest income |  |  |  |  |  |  |  |  | 1,361 | 1,209 | 1,175
Interest expense |  |  |  |  |  |  |  |  | 540 | 401 | 365
Total revenues, net of interest expense |  |  |  |  |  |  |  |  | 10,284 | 9,815 | 9,740
Total provision |  |  |  |  |  |  |  |  | 744 | 604 | 588
Pretax income |  |  |  |  |  |  |  |  | 2,999 | 2,945 | 3,164
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 972 | 1,036 | 1,142
Net Income from continuing operations |  |  |  |  |  |  |  |  | 2,027 | 1,909 | 2,022
Total assets | 52,600 |  |  |  | 46,500 |  |  |  | 52,600 | 46,500 | 45,100
Global Merchant Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest revenues |  |  |  |  |  |  |  |  | 4,333 | 4,235 | 4,471
Interest income |  |  |  |  |  |  |  |  | 1 | 1 | 1
Interest expense |  |  |  |  |  |  |  |  | (262) | (237) | (211)
Total revenues, net of interest expense |  |  |  |  |  |  |  |  | 4,596 | 4,473 | 4,683
Total provision |  |  |  |  |  |  |  |  | 15 | 25 | 31
Pretax income |  |  |  |  |  |  |  |  | 2,389 | 2,295 | 2,381
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 815 | 837 | 882
Net Income from continuing operations |  |  |  |  |  |  |  |  | 1,574 | 1,458 | 1,499
Total assets | 29,000 |  |  |  | 24,300 |  |  |  | 29,000 | 24,300 | 23,500
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-interest revenues |  |  |  |  |  |  |  |  | 259 | 447 | 389
Interest income |  |  |  |  |  |  |  |  | 407 | 261 | 226
Interest expense |  |  |  |  |  |  |  |  | 841 | 785 | 746
Total revenues, net of interest expense |  |  |  |  |  |  |  |  | (175) | (77) | (131)
Total provision |  |  |  |  |  |  |  |  | 3 | 7 | 5
Pretax income |  |  |  |  |  |  |  |  | (1,870) | (1,843) | (2,188)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 1,798 | (716) | (791)
Net Income from continuing operations |  |  |  |  |  |  |  |  | (3,668) | (1,127) | (1,397)
Total assets | $ (33,700) |  |  |  | $ (34,900) |  |  |  | $ (33,700) | $ (34,900) | $ (36,400)

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