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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Schedule of Leases | The following are additional details related to our lease portfolio:
|  | Dec. 31, | Dec. 31,
Millions | Classification | 2020 | 2019
Assets |  |  |  |  |
Operating leases | Operating lease assets | $ | 1,610 | $ | 1,812
Finance leases | Net properties [a] |  | 370 |  | 468
Total leased assets |  | $ | 1,980 | $ | 2,280
Liabilities |  |  |  |  |
Current |  |  |  |  |
Operating | Accounts payable and other current liabilities | $ | 321 | $ | 362
Finance | Debt due within one year |  | 109 |  | 114
Noncurrent |  |  |  |  |
Operating | Operating lease liabilities |  | 1,283 |  | 1,471
Finance | Debt due after one year |  | 340 |  | 491
Total lease liabilities |  | $ | 2,053 | $ | 2,438
[a] Finance lease assets are recorded net of accumulated amortization of $737 million and $797 million as of December 31, 2020 and 2019, respectively.
Schedule of Lease Cost | The lease cost components are classified as follows:
|  | Dec. 31, | Dec. 31,
Millions | Classification | 2020 | 2019
Operating lease cost [a] | Equipment and other rents | $ | 247 | $ | 305
Operating lease cost [a] | Purchased services and materials |  | 40 |  | 40
Operating lease cost [a] | Capitalized in net properties |  | 30 |  | 21
Finance lease cost |  |  |  |  |
Amortization of leased assets | Depreciation |  | 66 |  | 72
Interest on lease liabilities | Interest expense |  | 27 |  | 34
Net lease cost |  | $ | 410 | $ | 472
[a] In addition to the lease cost components referenced above, we had short-term lease costs of $26 million and $27 million as of December 31, 2020 and 2019, respectively, and variable lease costs of $10 million and $12 million as of December 31, 2020 and 2019, respectively.
Future Minimum Lease Payments For Operating And Finance Leases | The following table presents aggregate lease maturities as of December 31, 2020:
Millions |  | Operating Leases |  | Finance Leases |  | Total
2021 | $ | 325 | $ | 135 | $ | 460
2022 |  | 273 |  | 111 |  | 384
2023 |  | 229 |  | 81 |  | 310
2024 |  | 220 |  | 68 |  | 288
2025 |  | 216 |  | 45 |  | 261
After 2025 |  | 567 |  | 77 |  | 644
Total lease payments | $ | 1,830 | $ | 517 | $ | 2,347
Less: Interest |  | 226 |  | 68 |  | 294
Present value of lease liabilities | $ | 1,604 | $ | 449 | $ | 2,053
Weighted Average Remaining Lease Term and Discount Rate |
Millions |  | Operating Leases |  | Finance Leases |  | Total
2021 | $ | 325 | $ | 135 | $ | 460
2022 |  | 273 |  | 111 |  | 384
2023 |  | 229 |  | 81 |  | 310
2024 |  | 220 |  | 68 |  | 288
2025 |  | 216 |  | 45 |  | 261
After 2025 |  | 567 |  | 77 |  | 644
Total lease payments | $ | 1,830 | $ | 517 | $ | 2,347
Less: Interest |  | 226 |  | 68 |  | 294
Present value of lease liabilities | $ | 1,604 | $ | 449 | $ | 2,053
The following table presents the weighted average remaining lease term and discount rate:
| Dec. 31,
| 2020
Weighted-average remaining lease term (years) |  |
Operating leases |  | 7.9
Finance leases |  | 5.2
Weighted-average discount rate (%) |  |
Operating leases |  | 3.7
Finance leases |  | 5.1
Schedule of Leases - Other Information | The following table presents other information related to our operating and finance leases for the year ended December 31:
Millions | 2020 | 2019
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |
Operating cash flows from operating leases | $ | 323 | $ | 387
Investing cash flows from operating leases |  | 30 |  | 21
Operating cash flows from finance leases |  | 29 |  | 35
Financing cash flows from finance leases |  | 113 |  | 112
Leased assets obtained in exchange for finance lease liabilities |  | - |  | -
Leased assets obtained in exchange for operating lease liabilities |  | 93 |  | 118

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