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Intangible Assets - Narrative (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Acquired intangible assets  
Finite-Lived Intangible Assets [Line Items]  
Estimated annual amortization expense in 2019 $ 180
Estimated annual amortization expense in 2020 160
Estimated annual amortization expense in 2021 150
Estimated annual amortization expense in 2022 150
Estimated annual amortization expense in 2023 140
Capitalized and purchased software  
Finite-Lived Intangible Assets [Line Items]  
Estimated annual amortization expense in 2019 $ 210