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Goodwill and Intangible Assets - Intangible Asset Amortization (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
Amortization expense, 2018 $ 63
Amortization expense, 2019 63
Amortization expense, 2020 63
Amortization expense, 2021 63
Amortization expense, 2022 63
Amortization expense, 2023 $ 63