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Operating Leases	12 Months Ended
Operating Leases	Dec. 31, 2017
Operating Leases
Operating Leases	16. Operating Leases Rent expense attributable to all warehouse, office buildings and equipment operating leases was $84 million in 2017, $80 million in 2016, and $72 million in 2015. Minimum future rentals under operating leases are as follows: 2018, $73 million; 2019, $55 million; 2020, $40 million; 2021, $29 million; 2022, $24 million; and 2023 and thereafter, $37 million.