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Leases (Minimum Future Rentals On The Non-Cancellable Operating Leases) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 186
2021 179
2022 177
2023 170
2024 167
2025 and thereafter 1,072
Total minimum future rentals $ 1,951