Business Combinations - Allocation of Total Consideration to Fair Value of Assets and Liabilities of Quality Carriers (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jun. 01, 2022	Dec. 31, 2021	Jul. 01, 2021	Dec. 31, 2020
Assets Acquired:
Goodwill	$ 319		$ 276		$ 63
Pan-Am
Assets Acquired:
Accounts Receivable, net		$ 46
Properties and Equipment, net		600
Goodwill		17
Intangible Assets		90
Other Assets		11
Total Assets Acquired		764
Liabilities Assumed:
Accounts Payable and Accrued Liabilities		32
Deferred Tax Liabilities		75
Other Long-term Liabilities		57
Total Liabilities Assumed		164
Fair Value of Assets Acquired, Net of Liabilities Assumed:		$ 600
Quality Carriers
Assets Acquired:
Cash and Cash Equivalents				$ 3
Accounts Receivable, net				113
Properties and Equipment, net				225
Goodwill				213
Intangible Assets				180
Other Assets				9
Total Assets Acquired				743
Liabilities Assumed:
Accounts Payable and Accrued Liabilities				48
Finance Lease Obligations and Notes Payable				68
Casualty, Environmental and Other Reserves				62
Other Long-term Liabilities				21
Total Liabilities Assumed				199
Fair Value of Assets Acquired, Net of Liabilities Assumed:				$ 544