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Operating Leases	12 Months Ended
Operating Leases	Dec. 31, 2018
Operating Leases
Operating Leases	17. Operating Leases Rent expense attributable to all warehouse, office buildings and equipment operating leases was $91 million in 2018, $91 million in 2017, and $80 million in 2016. Minimum future rentals under operating leases are as follows: 2019, $69 million; 2020, $53 million; 2021, $41 million; 2022, $36 million; 2023, $29 million; and 2024 and thereafter, $40 million.