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Long-Term Debt - Future Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 29, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 $ 0  
2019 153  
2020 54  
2021 1,705  
2022 0  
Thereafter 0  
Total future maturities of long-term debt $ 1,912 $ 2,249