Investments in Unconsolidated Affiliates	3 Months Ended
Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Affiliates	Investments in Unconsolidated Affiliates On March 29, 2018, the Company completed the sale of a 55% controlling interest of each of Fiserv Automotive Solutions, LLC and Fiserv LS LLC, which were subsidiaries of the Company that owned its Lending Solutions business (collectively, the “Lending Joint Ventures”), to funds affiliated with Warburg Pincus LLC. The Lending Joint Ventures, which were reported within the Financial segment, included all of the Company’s automotive loan origination and servicing products, as well as its LoanServ^TM mortgage and consumer loan servicing platform. The Company received gross sale proceeds of $419 million from the transactions. During the three months ended March 31, 2018, the Company recognized a pre-tax gain on the sale of $232 million, with the related tax expense of $78 million recorded through the income tax provision, in the consolidated statements of income. The pre-tax gain included $124 million related to the remeasurement of the Company’s 45% retained interests based upon the estimated enterprise value of the Lending Joint Ventures. During the three months ended March 31, 2019, the Company recognized a pre-tax gain on the sale of $10 million, with the related tax expense of $2 million recorded through the income tax provision, as contingent special distribution provisions within the transaction agreement were resolved and thereby realized. The Company’s remaining 45% ownership interests in the Lending Joint Ventures are accounted for as equity method investments, with the Company’s share of net income (loss) reported as income (loss) from investments in unconsolidated affiliates and the related tax expense (benefit) reported within the income tax provision in the consolidated statements of income. The Company’s investment in the Lending Joint Ventures was $63 million and $65 million at March 31, 2019 and December 31, 2018, respectively, and is reported within other long-term assets in the consolidated balance sheets. The revenues, expenses and cash flows of the Lending Joint Ventures after the sale transactions are not included in the Company’s consolidated financial statements. Prior to the sale transactions described above, the Lending Joint Ventures entered into variable-rate term loan facilities for an aggregate amount of $350 million in senior unsecured debt and variable-rate revolving credit facilities for an aggregate amount of $35 million with a syndicate of banks, which transferred to the Lending Joint Ventures as part of the sale. The Company has guaranteed this debt of the Lending Joint Ventures and does not anticipate that the Lending Joint Ventures will fail to fulfill their debt obligations. These debt facilities mature in March 2023, and there are no outstanding borrowings on the revolving credit facilities as of March 31, 2019. The Company recorded an initial $34 million liability as a reduction to the gain on sale transactions for the estimated fair value of its obligations to stand ready to perform over the term of the guarantees, which is reported primarily within other long-term liabilities in the consolidated balance sheets. Such guarantees will be amortized in future periods over the contractual term. During the three months ended March 31, 2019, the Company recognized $1 million within non-operating income in its consolidated statements of income related to its release from risk under the guarantees. The Company has not made any payments under the guarantees, nor has it been called upon to do so. In conjunction with the sale transactions described above, the Company also entered into certain transition services agreements to provide, at fair value, various administration, business process outsourcing, technical and data center related services for defined periods to the Lending Joint Ventures. Amounts transacted through these agreements approximated $9 million during the three months ended March 31, 2019, and were primarily recognized as processing and services revenue in the consolidated statement of income.

Investments in Unconsolidated Affiliates

On March 29, 2018, the Company completed the sale of a 55% controlling interest of each of Fiserv Automotive Solutions, LLC and Fiserv LS LLC, which were subsidiaries of the Company that owned its Lending Solutions business (collectively, the “Lending Joint Ventures”), to funds affiliated with Warburg Pincus LLC. The Lending Joint Ventures, which were reported within the Financial segment, included all of the Company’s automotive loan origination and servicing products, as well as its LoanServ^TM mortgage and consumer loan servicing platform. The Company received gross sale proceeds of $419 million from the transactions. During the three months ended March 31, 2018, the Company recognized a pre-tax gain on the sale of $232 million, with the related tax expense of $78 million recorded through the income tax provision, in the consolidated statements of income. The pre-tax gain included $124 million related to the remeasurement of the Company’s 45% retained interests based upon the estimated enterprise value of the Lending Joint Ventures. During the three months ended March 31, 2019, the Company recognized a pre-tax gain on the sale of $10 million, with the related tax expense of $2 million recorded through the income tax provision, as contingent special distribution provisions within the transaction agreement were resolved and thereby realized. The Company’s remaining 45% ownership interests in the Lending Joint Ventures are accounted for as equity method investments, with the Company’s share of net income (loss) reported as income (loss) from investments in unconsolidated affiliates and the related tax expense (benefit) reported within the income tax provision in the consolidated statements of income. The Company’s investment in the Lending Joint Ventures was $63 million and $65 million at March 31, 2019 and December 31, 2018, respectively, and is reported within other long-term assets in the consolidated balance sheets. The revenues, expenses and cash flows of the Lending Joint Ventures after the sale transactions are not included in the Company’s consolidated financial statements.

Prior to the sale transactions described above, the Lending Joint Ventures entered into variable-rate term loan facilities for an aggregate amount of $350 million in senior unsecured debt and variable-rate revolving credit facilities for an aggregate amount of $35 million with a syndicate of banks, which transferred to the Lending Joint Ventures as part of the sale. The Company has guaranteed this debt of the Lending Joint Ventures and does not anticipate that the Lending Joint Ventures will fail to fulfill their debt obligations. These debt facilities mature in March 2023, and there are no outstanding borrowings on the revolving credit facilities as of March 31, 2019. The Company recorded an initial $34 million liability as a reduction to the gain on sale transactions for the estimated fair value of its obligations to stand ready to perform over the term of the guarantees, which is reported primarily within other long-term liabilities in the consolidated balance sheets. Such guarantees will be amortized in future periods over the contractual term. During the three months ended March 31, 2019, the Company recognized $1 million within non-operating income in its consolidated statements of income related to its release from risk under the guarantees. The Company has not made any payments under the guarantees, nor has it been called upon to do so. In conjunction with the sale transactions described above, the Company also entered into certain transition services agreements to provide, at fair value, various administration, business process outsourcing, technical and data center related services for defined periods to the Lending Joint Ventures. Amounts transacted through these agreements approximated $9 million during the three months ended March 31, 2019, and were primarily recognized as processing and services revenue in the consolidated statement of income.