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Summary of Significant Accounting Policies - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,424 | $ 3,967
Accumulated Amortization | 2,281 | 2,085
Net Book Value | 2,143 | 1,882
Customer related intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,642 | 2,293
Accumulated Amortization | 1,294 | 1,168
Net Book Value | 1,348 | 1,125
Acquired software and technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 591 | 579
Accumulated Amortization | 490 | 460
Net Book Value | 101 | 119
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 120 | 117
Accumulated Amortization | 71 | 64
Net Book Value | 49 | 53
Capitalized software development costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 810 | 737
Accumulated Amortization | 314 | 282
Net Book Value | 496 | 455
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 261 | 241
Accumulated Amortization | 112 | 111
Net Book Value | $ 149 | $ 130

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