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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2018 | Jan. 17, 2017
Business Acquisition [Line Items] |  |  |  |  |
Loss on early debt extinguishment | $ (14) | $ 0 | $ 0 |  |
Debt guarantee arrangements, fair value | 6,000 | 5,000 |  |  |
Contingent consideration liability, fair value |  | $ 15 |  |  |
Elan Financial Services |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration liability, fair value | 12 |  |  | $ 12 |
Online Banking Solutions, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration liability, fair value | 5 |  |  |  | $ 15
Non-cash fair value adjustment decrease on contingent consideration | 10 |  |  |  |
Variable-Rate Revolving Credit Facilities and Variable-Rate Term Loan Facilities Due March 2023 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt guarantee arrangements, fair value | $ 29 |  |  |  |

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