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Visa Europe Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Visa Europe |  |
Business Acquisition [Line Items] |  |
Net operating revenues | $ 4,461 | $ 3,964
Net income | $ 2,070 | $ 1,776
Diluted earnings per share (in USD per share) | $ 0.86 | $ 0.71
Senior Notes | Visa Europe |  |
Business Acquisition [Line Items] |  |
Debt issued | $ 16,000 |
Visa Europe put option |  |
Business Acquisition [Line Items] |  |
Revaluation of the Visa Europe put option |  | $ (255)

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