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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill, Customer Relationships, and Other Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Jan. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 18,854 | $ 0 | $ 18,870
Indefinite-life intangible assets | 9 |  | 278
Total other intangible assets, net | 7,884 |  | 8,219
Customer relationships |  |  |
Goodwill [Line Items] |  |  |
Finite-lived intangible assets, net | 6,035 |  | 6,344
Accumulated amortization | 11,356 |  | 11,060
Capitalized software |  |  |
Goodwill [Line Items] |  |  |
Finite-lived intangible assets, net | 1,509 |  | 1,520
Accumulated amortization | 3,366 |  | 3,279
Trade names, patents and other |  |  |
Goodwill [Line Items] |  |  |
Finite-lived intangible assets, net | 331 |  | 77
Accumulated amortization | $ 134 |  | $ 120

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