Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
At lower of LIFO cost or market:
Live hogs and materials	$ 332	$ 313
Fresh pork and materials	36	28
Inventories at lower of LIFO cost or market, Gross	368	341
LIFO adjustment	(34)	(31)
Total inventories at lower of LIFO cost or market	334	310
At lower of FIFO cost and net realizable value:
Grains, oilseeds and other commodities	209	253
Sugar produced and in process	39	38
Other	76	90
Total inventories at lower of FIFO cost and net realizable value	324	381
Grain, flour and feed at lower of weighted average cost and net realizable value	139	89
Total inventories	$ 797	$ 780