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Operating Leases	12 Months Ended
Operating Leases	Dec. 31, 2015
Operating Leases
Operating Leases	16. Operating Leases Rent expense attributable to all warehouse, office buildings and equipment operating leases was $72 million in 2015, $63 million in 2014, and $57 million in 2013. Minimum future rentals under operating leases are as follows: 2016, $82 million; 2017, $78 million; 2018, $73 million; 2019, $65 million; 2020, $65 million; and 2021 and thereafter, $42 million.