Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
At lower of FIFO cost and NRV:
Hogs and materials	$ 437	$ 387
Fresh pork and materials	46	50
Grains, oilseeds and other commodities	380	353
Biodiesel	72	43
Sugar produced and in process	24	17
Other	61	62
Total inventories at lower of FIFO cost and NRV	1,020	912
Grain, flour and feed at lower of weighted average cost and NRV	158	174
Total inventories	$ 1,178	$ 1,086