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Business Combinations - Allocation of Total Consideration to Fair Value of Assets and Liabilities of Quality Carriers (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Jul. 01, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Assets Acquired: |  |  |  |
Goodwill | $ 276 |  | $ 63 | $ 63
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 |  |

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