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Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ 5,854 | $ 5,494 | $ 11,908 | $ 11,000
U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 2,650 | 2,479 | 5,367 | 4,987
International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 3,204 | 3,015 | 6,541 | 6,013
Service revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 2,623 | 2,417 | 5,178 | 4,759
Data processing revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 2,711 | 2,432 | 5,575 | 4,902
International transaction revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 1,833 | 1,796 | 3,851 | 3,647
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 392 | 327 | 757 | 626
Client incentives |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ (1,705) | $ (1,478) | $ (3,453) | $ (2,934)

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