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Acquisitions - Amortization expense (Details)
$ in Millions
Dec. 31, 2018
USD ($)
SquareTrade  
Business Acquisition [Line Items]  
2019 $ 72
2020 62
2021 52
2022 42
2023 34
Thereafter 50
Total amortization 312
InfoArmor  
Business Acquisition [Line Items]  
2019 50
2020 44
2021 38
2022 31
2023 25
Thereafter 56
Total amortization $ 244