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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 20,696 | $ 21,036 |
Accumulated Amortization | 5,338 | 3,394 |
Net Book Value | 15,358 | 17,642 |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 15,271 | 16,187 |
Accumulated Amortization | 3,668 | 2,145 |
Net Book Value | 11,603 | 14,042 |
Acquired software and technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2,562 | 2,607 |
Accumulated Amortization | 879 | 639 |
Net Book Value | 1,683 | 1,968 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 618 | 620 |
Accumulated Amortization | 172 | 105 |
Net Book Value | 446 | 515 |
Purchased software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 913 | 680 |
Accumulated Amortization | 207 | 173 |
Net Book Value | 706 | 507 |
Capitalized software and other intangibles |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,332 | 942 |
Accumulated Amortization | 412 | 332 |
Net Book Value | 920 | 610 |
Gross software development costs capitalized | $ 462 | $ 339 | $ 193

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