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Acquisitions and Dispositions - Total Purchase Price Paid (Details) - First Data - USD ($) $ / shares in Units, shares in Millions, $ in Millions | Jul. 29, 2019 | Jul. 26, 2019
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Business Acquisition [Line Items] |  |
Repayment of First Data debt | $ 16,414 |
Total purchase price | 46,475 |
Share price of shares issued for acquisition (in dollars per share) |  | $ 102.30
Common Shares |  |
Business Acquisition [Line Items] |  |
Fair value of exchanges | $ 29,293 |
Number of shares issued for acquisition (in shares) | 286 |
Equity Awards |  |
Business Acquisition [Line Items] |  |
Fair value of exchanges | $ 768 |
Number of shares issued for acquisition (in shares) | 15 |

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