Acquisitions - Fair Value (Details) - USD ($) $ in Millions						3 Months Ended					12 Months Ended
	Mar. 09, 2017	Dec. 29, 2016	Nov. 29, 2016	Aug. 03, 2015	Mar. 11, 2015	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other disclosures
Consideration net of cash											$ 17	$ 407	$ 434
Increase in pre-tax cost of sales for fair value mark-up of acquired inventory											9		10
Pre-tax Acquisition and integration costs						$ 1	$ 1	$ 1	$ 1	$ 1	4	$ 3	$ 10
TIC Gums
Other disclosures
Consideration net of cash		$ 396
Tangible assets		37
Kerr
Other disclosures
Consideration net of cash				$ 102
Tangible assets				8
Shandong Huanong
Other disclosures
Cash consideration			$ 12
Tangible assets			$ 9
Sun Flour
Other disclosures
Cash consideration											$ 16
Total purchase consideration	$ 18
Intangible Assets, Net (Including Goodwill)	$ 21
Penford
Other disclosures
Total purchase consideration					$ 332
Fair Value, Inputs, Level 3 | TIC Gums | Customer relationships | Multi-period excess earnings method
Identifiable intangible assets
Fair Value		$ 94
Estimated Remaining Useful Life		20 years
Fair Value, Inputs, Level 3 | TIC Gums | Trade names | Relief-from-royalty method
Identifiable intangible assets
Fair Value		$ 35
Fair Value, Inputs, Level 3 | TIC Gums | Technology | Relief-from-royalty method
Identifiable intangible assets
Fair Value		$ 4
Estimated Remaining Useful Life		8 years
Fair Value, Inputs, Level 3 | Kerr | Customer relationships | Multi-period excess earnings method
Identifiable intangible assets
Fair Value				$ 24
Estimated Remaining Useful Life				15 years
Fair Value, Inputs, Level 3 | Kerr | Trade names | Relief-from-royalty method
Identifiable intangible assets
Fair Value				$ 4
Estimated Remaining Useful Life				11 years
Fair Value, Inputs, Level 3 | Kerr | Noncompetition Agreements | Income Approach
Identifiable intangible assets
Fair Value				$ 1
Estimated Remaining Useful Life				3 years