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Debt - Maturities (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
Weighted-average maturity of long-term debt 11 years
Maturities  
2019 $ 500
2020 500
2021 600
2022 750
2023 1,300
Thereafter $ 5,554