Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 19, 2019	Jun. 29, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	SNDR
Entity Registrant Name	SCHNEIDER NATIONAL, INC.
Entity Central Index Key	0001692063
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Small Business	false
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 1.3
Class A Common Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (shares)		83,029,500
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (shares)		93,995,072