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Acquisitions and Dispositions - Gross Carrying Amount and Weighted-Average Useful Life Allocated to Intangible Assets (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 29, 2019 | Dec. 31, 2020 | Dec. 31, 2019
First Data |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 16,272 |  |
Weighted-Average Useful Life | 14 years |  |
First Data | Customer relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 13,458 |  |
Weighted-Average Useful Life | 15 years |  |
First Data | Acquired software and technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 2,324 |  |
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 |  |  |
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 |  | $ 81 |
Weighted-Average Useful Life |  | 11 years |
Series of Individually Immaterial Business Acquisitions | Customer relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 32 |
Weighted-Average Useful Life |  | 14 years |
Series of Individually Immaterial Business Acquisitions | Residual buyouts |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 35 |
Weighted-Average Useful Life |  | 9 years |
Series of Individually Immaterial Business Acquisitions | Acquired software and technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 14 |
Weighted-Average Useful Life |  | 8 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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