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Goodwill and Acquired Intangible Assets (Schedule of Changes in Goodwill) (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Goodwill [Roll Forward] |
Balance at beginning of period | $ 6,586
Reclassification of goodwill | 0
Foreign currency translation adjustment | (217)
Balance at end of period | 6,369
Market Services |
Goodwill [Roll Forward] |
Balance at beginning of period | 3,546
Reclassification of goodwill | 0
Foreign currency translation adjustment | (111)
Balance at end of period | 3,435
Corporate Services |
Goodwill [Roll Forward] |
Balance at beginning of period | 490
Reclassification of goodwill | 29
Foreign currency translation adjustment | (16)
Balance at end of period | 503
Information Services |
Goodwill [Roll Forward] |
Balance at beginning of period | 2,362
Reclassification of goodwill | 0
Foreign currency translation adjustment | (79)
Balance at end of period | 2,283
Market Technology |
Goodwill [Roll Forward] |
Balance at beginning of period | 188
Reclassification of goodwill | (29)
Foreign currency translation adjustment | (11)
Balance at end of period | $ 148

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