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Reportable Operating Segements and Geographic Operations (Details 1) - 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 Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
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
Pretax income | $ 1,821 | $ 1,827 | $ 1,949 | $ 1,817 | $ 1,161 | $ 1,735 | $ 3,016 | $ 2,184 | 7,414 | 8,096 | 7,938
United States Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 24,737 | 24,133 | 24,927
Pretax income |  |  |  |  |  |  |  |  | 7,071 | 8,202 | 7,500
EMEA Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 3,583 | 3,248 | 3,293
Pretax income |  |  |  |  |  |  |  |  | 898 | 482 | 544
JAPA Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 3,204 | 3,052 | 2,791
Pretax income |  |  |  |  |  |  |  |  | 602 | 559 | 587
LACC Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 2,396 | 2,274 | 2,412
Pretax income |  |  |  |  |  |  |  |  | 610 | 597 | 693
Other Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | (449) | (588) | (605)
Pretax income |  |  |  |  |  |  |  |  | $ (1,767) | $ (1,744) | $ (1,386)

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