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Goodwill and Other Intangible Assets - Estimated Aggregate Pre-Tax Amortization Expense Related to Intangible Assets (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense remainder of 2018 $ 6
Amortization expense 2019 12
Amortization expense 2020 11
Amortization expense 2021 11
Amortization expense 2022 $ 11