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Intangible Assets - Narrative (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Acquired intangible assets  
Finite-Lived Intangible Assets [Line Items]  
Estimated annual amortization expense in 2019 $ 1,000
Estimated annual amortization expense in 2020 2,100
Estimated annual amortization expense in 2021 2,100
Estimated annual amortization expense in 2022 1,900
Estimated annual amortization expense in 2023 1,800
Capitalized and purchased software  
Finite-Lived Intangible Assets [Line Items]  
Estimated annual amortization expense in 2019 $ 270