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Goodwill and Other Intangible Assets - Estimated Aggregate Pre-Tax Amortization Expense Related to Intangible Assets (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense remainder of 2019 $ 4
Amortization expense 2020 16
Amortization expense 2021 16
Amortization expense 2022 16
Amortization expense 2023 $ 16