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Long-Term Debt - Capital Lease Obligations (Details) - Capital Lease Obligations
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
lease
Dec. 31, 2017
Capital Leased Assets [Line Items]    
Number of leases acquired | lease 3  
Capital lease obligations $ 44  
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019 - 2023 (annually $7 million) 35  
2019 7  
2020 7  
2021 7  
2022 7  
2023 7  
Thereafter 37  
Total future payments 72  
Less: amount representing interest 28  
Present value of future minimum payments 44  
Less: current portion 3  
Long-term portion $ 41  
Minimum    
Capital Leased Assets [Line Items]    
Remaining term of leases 44 months  
Maximum    
Capital Leased Assets [Line Items]    
Remaining term of leases   130 months