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Segment Information (Segment and Geographic Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 5,369.4 | $ 5,754.6 | $ 15,862.2 | $ 17,480.2
Operating Income | 2,417.7 | 3,079.4 | 6,823.1 | 7,408.5
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,930.0 | 2,023.3 | 5,758.4 | 6,000.7
Operating Income | 1,061.8 | 1,034.6 | 3,059.0 | 3,055.4
International Lead Markets |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,940.5 | 1,970.5 | 5,748.9 | 5,427.2
Operating Income | 913.9 | 913.6 | 2,613.5 | 2,356.2
High Growth Markets |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,040.2 | 1,322.1 | 3,026.4 | 4,538.5
Operating Income | 330.1 | 1,073.8 | 847.1 | 1,724.0
Foundational Markets and Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 458.7 | 438.7 | 1,328.5 | 1,513.8
Operating Income | $ 111.9 | $ 57.4 | $ 303.5 | $ 272.9

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