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Related Party Transactions (Details) - USD ($) shares in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 14, 2020 | Dec. 04, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020
Fiserv |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Secondary public offering (in shares) | $ 20,100,000 |  |  |  |  |
New Omaha |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of shares to be repurchased (in shares) | 1.8 |  |  |  |  |
Share repurchase amount |  | $ 200,000,000 |  |  |  |
New Omaha | Fiserv |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage by noncontrolling owner | 13.00% |  | 16.00% |  |  |
Merchant Alliances |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Amounts due from unconsolidated merchant alliances |  |  | $ 37,000,000 | $ 35,000,000 |  |
Merchant Alliances | Merchant Alliances, Fees |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Processing, administrative service, and other fees |  |  | 183,000,000 | 76,000,000 |  |
Merchant Alliances | Related Party Fees |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Processing, administrative service, and other fees |  |  | $ 236,000,000 | 112,000,000 | $ 28,000,000 |
Joint Venture | Banc of America Merchant Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of interest in joint venture |  |  | 51.00% |  |  | 51.00%
Affiliated Entity | Related Party Fees | Lending Solutions Business And Investment Services Business |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Processing, administrative service, and other fees |  |  | $ 58,000,000 | $ 36,000,000 | $ 30,000,000 |

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