Investments in Unconsolidated Affiliates	3 Months Ended
Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Affiliates	Investments in Unconsolidated Affiliates Lending Joint Ventures 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, include 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. 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 statement of income. The pre-tax gain includes $124 million related to the remeasurement of the Company’s 45% retained interests based upon the estimated enterprise value of the Lending Joint Ventures. Contingent consideration of up to $20 million under defined special distribution provisions within the transaction agreements is being accounted for by the Company as a gain contingency and will therefore be recognized in future periods to the extent the contingency is resolved and thereby realized. The Company’s remaining 45% ownership interests of $58 million at March 31, 2018 are accounted for as equity method investments and are reported within other long-term assets in the consolidated balance sheet. The Company will report its share of the Lending Joint Ventures’ net income as income from investments in unconsolidated affiliates, and the revenues and expenses of the Lending Joint Ventures after the sale transactions are not included in the Company’s consolidated statements of income. The Company’s consolidated financial statements for all periods prior to the sale transactions include the revenues, expenses and cash flows of the Lending Joint Ventures. 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 have been no borrowings on the revolving credit facilities. The Company has recorded a $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 are reported primarily within other long-term liabilities in the consolidated balance sheet. In conjunction with the sale transactions described above, the Company also entered into certain transition services agreements to provide various administration, business process outsourcing, technical and data center related services for defined periods to the Lending Joint Ventures. StoneRiver Group, L.P. The Company owns a 49% interest in StoneRiver Group, L.P. (“StoneRiver”), which is accounted for as an equity method investment. The Company reports its share of StoneRiver’s net income as income from investment in unconsolidated affiliate, with the related tax expense reported within the income tax provision, in the consolidated statements of income. During the three months ended March 31, 2017, StoneRiver recognized a gain on the sale of a business. The Company’s pre-tax share of the gain was $26 million, with related tax expense of $9 million. During the three months ended March 31, 2017, the Company received a cash dividend of $31 million from StoneRiver, which was funded from the sale transaction and recorded as a reduction in the Company’s investment in StoneRiver. The entire dividend represented a return on the Company’s investment and is reported in cash flows from operating activities.

Investments in Unconsolidated Affiliates

Lending Joint Ventures

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, include 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. 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 statement of income. The pre-tax gain includes $124 million related to the remeasurement of the Company’s 45% retained interests based upon the estimated enterprise value of the Lending Joint Ventures. Contingent consideration of up to $20 million under defined special distribution provisions within the transaction agreements is being accounted for by the Company as a gain contingency and will therefore be recognized in future periods to the extent the contingency is resolved and thereby realized. The Company’s remaining 45% ownership interests of $58 million at March 31, 2018 are accounted for as equity method investments and are reported within other long-term assets in the consolidated balance sheet. The Company will report its share of the Lending Joint Ventures’ net income as income from investments in unconsolidated affiliates, and the revenues and expenses of the Lending Joint Ventures after the sale transactions are not included in the Company’s consolidated statements of income. The Company’s consolidated financial statements for all periods prior to the sale transactions include the revenues, expenses and cash flows of the Lending Joint Ventures.

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 have been no borrowings on the revolving credit facilities. The Company has recorded a $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 are reported primarily within other long-term liabilities in the consolidated balance sheet. In conjunction with the sale transactions described above, the Company also entered into certain transition services agreements to provide various administration, business process outsourcing, technical and data center related services for defined periods to the Lending Joint Ventures.

StoneRiver Group, L.P.

The Company owns a 49% interest in StoneRiver Group, L.P. (“StoneRiver”), which is accounted for as an equity method investment. The Company reports its share of StoneRiver’s net income as income from investment in unconsolidated affiliate, with the related tax expense reported within the income tax provision, in the consolidated statements of income. During the three months ended March 31, 2017, StoneRiver recognized a gain on the sale of a business. The Company’s pre-tax share of the gain was $26 million, with related tax expense of $9 million. During the three months ended March 31, 2017, the Company received a cash dividend of $31 million from StoneRiver, which was funded from the sale transaction and recorded as a reduction in the Company’s investment in StoneRiver. The entire dividend represented a return on the Company’s investment and is reported in cash flows from operating activities.