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Commitments, Contingencies And Guarantees (Minimum Annual Lease Commitments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Commitments, Contingencies And Guarantees [Abstract]  
2019 $ 18
2020 19
2021 16
2022 16
2023 15
Thereafter 83
Total future minimum annual lease commitments $ 167