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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Asset impairments | $ 94 |  |  |
Impairment of held for use assets | 42 |  |  |
Operating lease impairment loss | 30 |  |  |
Operating lease ROU assets | 534 | $ 564 |  |
Operating lease liability | $ 605 | $ 595 |  |
Purchase of common shares (in shares) (current year less than) | 1 | 1 | 1 |
ASU 2016-02 |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Operating lease ROU assets |  |  |  | $ 442
Operating lease liability |  |  |  | $ 446
Merchant Solutions |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Reporting unit, percentage of fair value in excess of carrying amount | 4.00% |  |  |
Asset impairments | $ 0 |  |  |
Corporate and Other |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Asset impairments | $ 94 |  |  |
Buildings |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Fixed asset, estimated useful life | 30 years |  |  |
Minimum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Lease renewal term | 1 year |  |  |
Minimum | Furniture and fixture |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Fixed asset, estimated useful life | 3 years |  |  |
Maximum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Lease renewal term | 5 years |  |  |
Maximum | Furniture and fixture |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Fixed asset, estimated useful life | 7 years |  |  |
Customer relationships |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |
Trademarks | Maximum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 5 years |  |  |
Software | Minimum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 1 year |  |  |
Software | Maximum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |
Internally developed software | Minimum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 3 years |  |  |
Internally developed software | Maximum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |

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