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Acquisitions and Dispositions - Gross Carrying Amount and Weighted-Average Useful Life Allocated to Intangible Assets (Details) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 29, 2019 | Sep. 30, 2019 | Dec. 31, 2017
First Data |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 16,424 |  |
Weighted-Average Useful Life | 14 years |  |
First Data | Customer relationships, net |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 13,613 |  |
Weighted-Average Useful Life | 15 years |  |
First Data | Acquired software and technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 2,321 |  |
Weighted-Average Useful Life | 7 years |  |
First Data | Trade names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 490 |  |
Weighted-Average Useful Life | 9 years |  |
Elan Financial Services |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 373 |
Weighted-Average Useful Life |  | 15 years |
Elan Financial Services | Customer relationships, net |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 370 |
Weighted-Average Useful Life |  | 15 years |
Elan Financial Services | Trade names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 3 |
Weighted-Average Useful Life |  | 8 years |
Series of Individually Immaterial Business Acquisitions |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  |  | $ 163
Weighted-Average Useful Life |  |  | 12 years
Series of Individually Immaterial Business Acquisitions | Customer relationships, net |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  |  | $ 92
Weighted-Average Useful Life |  |  | 15 years
Series of Individually Immaterial Business Acquisitions | Acquired software and technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  |  | $ 71
Weighted-Average Useful Life |  |  | 7 years

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