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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 21,036 | $ 4,424 |
Accumulated Amortization | 3,394 | 2,281 |
Net Book Value | 17,642 | 2,143 |
Customer related intangible assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 16,187 | 2,642 |
Accumulated Amortization | 2,145 | 1,294 |
Net Book Value | 14,042 | 1,348 |
Acquired software and technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2,607 | 591 |
Accumulated Amortization | 639 | 490 |
Net Book Value | 1,968 | 101 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 620 | 120 |
Accumulated Amortization | 105 | 71 |
Net Book Value | 515 | 49 |
Capitalized software development costs |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 942 | 810 |
Accumulated Amortization | 332 | 314 |
Net Book Value | 610 | 496 |
Gross software development costs capitalized | 339 | 193 | $ 159
Purchased software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 680 | 261 |
Accumulated Amortization | 173 | 112 |
Net Book Value | $ 507 | $ 149 |

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