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Leases - (Future Minimum Lease Payments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Gross Lease Commitments  
Operating Leased Assets [Line Items]  
2019 $ 80
2020 74
2021 66
2022 48
2023 45
Thereafter 347
Total future minimum lease payments 660
Sublease Income  
Operating Leased Assets [Line Items]  
2019 5
2020 5
2021 4
2022 4
2023 3
Thereafter 2
Total future minimum lease payments 23
Net Lease Commitments  
Operating Leased Assets [Line Items]  
2019 75
2020 69
2021 62
2022 44
2023 42
Thereafter 345
Total future minimum lease payments $ 637