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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,519 | $ 4,424
Accumulated Amortization | 2,417 | 2,281
Net Book Value | 2,102 | 2,143
Customer related intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,642 | 2,642
Accumulated Amortization | 1,365 | 1,294
Net Book Value | 1,277 | 1,348
Acquired software and technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 591 | 591
Accumulated Amortization | 505 | 490
Net Book Value | 86 | 101
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 120 | 120
Accumulated Amortization | 74 | 71
Net Book Value | 46 | 49
Capitalized software development costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 893 | 810
Accumulated Amortization | 353 | 314
Net Book Value | 540 | 496
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 273 | 261
Accumulated Amortization | 120 | 112
Net Book Value | $ 153 | $ 149

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