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Long-Term Debt and Revolving Promissory Note - Schedule of Debt Maturity (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Debt Disclosure [Abstract]  
2018 (remaining three months) $ 4
2019 11
2020 5
2021 951
2022 0
2023 and thereafter 5,109
Total long-term debt $ 6,080