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Income Taxes - Valuation allowance (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Taxes
Increase in valuation allowance of foreign subsidiary net deferred tax assets	$ 6	$ 16	$ 7
Percentage increase in valuation allowance of foreign subsidiary net deferred tax assets	1.0	2.0	1.0

X

- Definition

The amount of increase in the valuation allowance on the net deferred tax assets of a foreign subsidiary.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

The percentage increase in the valuation allowance on the net deferred tax assets of a foreign subsidiary.

+ References

No definition available.

+ Details

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Namespace Prefix:	ingr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration