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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