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Rental Income under Operating Leases Rental Income under Operating Leases (Minimum Future Rental Income) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Rental Income Under Operating Leases [Abstract]  
2017 $ 56
2018 41
2019 23
2020 11
2021 7
Thereafter 6
Total minimum future rentals $ 144