Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill
Goodwill	$ 2,496	$ 2,374
Goodwill and Intangible Asset Impairment	9	0	$ 11
Finite-Lived Intangible Assets, Period Increase (Decrease)	26
Intangible Assets Foreign Currency Translation Gain (Loss)	63
Goodwill, Foreign Currency Translation Gain (Loss)	77
Amortization of Intangible Assets	129	122	113
Amortization expense of intangible assets next 12 months	146
Finite-Lived Intangible Assets, Amortization Expense, Year Two	143
Finite-Lived Intangible Assets, Amortization Expense, Year Three	136
Finite-Lived Intangible Assets, Amortization Expense, Year Four	131
Finite-Lived Intangible Assets, Amortization Expense, Year Five	124
Series of Individually Immaterial Business Acquisitions [Member]
Goodwill
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	132	47	41
Goodwill	187	$ 33	$ 72
Protexin, Rodelle, and Algar Agro [Member]
Goodwill
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 132