Business Combinations - Preliminary Allocation of Total Consideration to Fair Value of Assets and Liabilities of Quality Carriers (Details) - Quality Carriers $ in Millions	Jul. 01, 2021 USD ($)
Assets Acquired:
Cash and Cash Equivalents	$ 3
Accounts Receivable, net	113
Properties and Equipment, net	225
Goodwill	200
Intangible Assets	190
Other Assets	11
Total Assets Acquired	742
Liabilities Assumed:
Accounts Payable and Accrued Liabilities	48
Finance Lease Obligations and Notes Payable	68
Casualty, Environmental and Other Reserves	60
Other Long-term Liabilities	20
Total Liabilities Assumed	196
Fair Value of Assets Acquired, Net of Liabilities Assumed:	$ 546