Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
At lower of LIFO cost or market:
Live hogs and materials	$ 340	$ 313
Fresh pork and materials	36	28
Inventories at lower of LIFO cost or market, Gross	376	341
LIFO adjustment	(37)	(31)
Total inventories at lower of LIFO cost or market	339	310
At lower of FIFO cost and net realizable value:
Grains, oilseeds and other commodities	306	253
Sugar produced and in process	36	38
Other	58	90
Total inventories at lower of FIFO cost and net realizable value	400	381
Grain, flour and feed at lower of weighted average cost and net realizable value	135	89
Total inventories	$ 874	$ 780