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Lease Commitments - Lease Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Operating lease assets | $ 1,196 | $ 1,411
Finance lease assets | $ 329 | $ 397
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Total leased assets | $ 1,525 | $ 1,808
Liabilities: |  |
Operating lease liabilities, current | 459 | 579
Current finance leases | $ 33 | $ 51
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:DebtCurrent | us-gaap:DebtCurrent
Operating lease liabilities, non-current | $ 786 | $ 872
Finance lease liabilities, non-current | $ 292 | $ 347
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:LongTermDebtNoncurrent | us-gaap:LongTermDebtNoncurrent
Total lease liabilities | $ 1,570 | $ 1,849

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