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Leases | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Leases of Lessee Disclosure [Text Block] | Leases Lessee Accounting The Company leases certain transportation equipment, plant equipment, office equipment, land, buildings, and storage facilities. Most leases include options to renew, with renewal terms that can extend the lease term from 10 months to 49 years. The renewal options are not included in the measurement of the right of use assets and lease liabilities unless the Company is reasonably certain to exercise the optional renewal periods. Certain leases also include index and non-index escalation clauses and options to purchase the leased property. Leases accounted for as finance leases were immaterial at December 31, 2020. As an accounting policy election, the Company does not apply the recognition requirements of Topic 842 to short-term leases in all of its underlying asset categories. The Company recognizes short-term lease payments in earnings on a straight-line basis over the lease term, and variable lease payments in the period in which the obligation for those payments is incurred. The Company also combines lease and non-lease contract components in all of its underlying asset categories as an accounting policy election. The following table sets forth the amounts relating to the Company’s total lease cost and other information.
| Year Ended
| December 31, 2020 | December 31, 2019
| (In millions)
Lease cost: |  |
Operating lease cost | $ | 315 |  | $ | 275 |
Short-term lease cost | 101 |  | 99 |
Total lease cost | $ | 416 |  | $ | 374 |
Other information: |  |
Operating lease liability principal payments | $ | 302 |  | $ | 209 |
Right-of-use assets obtained in exchange for new operating lease liabilities | $ | 314 |  | $ | 302 |
| December 31, 2020 | December 31, 2019
Weighted-average remaining lease term - operating leases (in years) | 7 | 7
Weighted average discount rate - operating leases | 4.2 | % | 4.6 | %
Below is a tabular disclosure of the future annual undiscounted cash flows for operating lease liabilities as of December 31, 2020.
| Undiscounted
| Cash Flows
| (In millions)
2021 | $ | 302 |
2022 | 268 |
2023 | 218 |
2024 | 156 |
2025 | 95 |
Thereafter | 260 |
Total | 1,299 |
Less interest (1) | (175) |
Lease liability | $ | 1,124 |
(1) Calculated using the implicit rate of the lease, if available, or the incremental borrowing rate that is appropriate for the tenor and geography of the lease.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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