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Reportable Operating Segements and Geographic Operations (Details 1) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense | $ 8,022 | $ 7,774 | $ 8,235 | $ 8,088 | $ 8,391 | $ 8,193 | $ 8,284 | $ 7,950 | $ 32,119 | $ 32,818 | $ 34,188
Pretax income | $ 1,161 | $ 1,735 | $ 3,016 | $ 2,184 | $ 1,454 | $ 1,938 | $ 2,230 | $ 2,316 | 8,096 | 7,938 | 8,991
United States Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 24,133 | 24,927 | 24,678
Pretax income |  |  |  |  |  |  |  |  | 8,202 | 7,500 | 8,406
EMEA Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 3,248 | 3,293 | 3,574
Pretax income |  |  |  |  |  |  |  |  | 482 | 544 | 528
JAPA Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 3,052 | 2,791 | 2,923
Pretax income |  |  |  |  |  |  |  |  | 559 | 587 | 565
LACC Geographic Region [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 2,274 | 2,412 | 2,784
Pretax income |  |  |  |  |  |  |  |  | 597 | 693 | 675
Other Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense |  |  |  |  |  |  |  |  | (588) | (605) | 229
Pretax income |  |  |  |  |  |  |  |  | $ (1,744) | $ (1,386) | $ (1,183)

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