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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill, Customer Relationships, and Other Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 21,507 | $ 28,031
Finite-lived intangible assets, net | 7,902 | 8,911
Indefinite-life intangible assets | 269 | 269
Total other intangible assets, net | 1,977 | 1,868
Customer relationships |  |
Goodwill [Line Items] |  |
Finite-lived intangible assets, net | 7,902 | 8,911
Accumulated amortization | 9,481 | 8,492
Computer Software, Intangible Asset |  |
Goodwill [Line Items] |  |
Finite-lived intangible assets, net | 1,599 | 1,468
Accumulated amortization | 2,858 | 2,616
Trade Names and Patents |  |
Goodwill [Line Items] |  |
Finite-lived intangible assets, net | 109 | 131
Accumulated amortization | $ 83 | $ 61

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