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Leases - Balance sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Operating leases | $ 466 | $ 424
Operating right of use asset extensible list | us-gaap:OtherAssetsCurrent | us-gaap:OtherAssetsCurrent
Financing lease | $ 386 | $ 374
Financing Lease, right of use asset extensible list | us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Total leased assets | $ 852 | $ 798
Liabilities |  |
Operating, current | $ 63 | $ 79
Operating Lease, Liability current extensible list | us-gaap:AccruedLiabilitiesCurrent | us-gaap:AccruedLiabilitiesCurrent
Financing, current | $ 50 | $ 36
Financing Lease, Liability current extensible list | us-gaap:DebtCurrent | us-gaap:DebtCurrent
Operating, non current | $ 453 | $ 366
Operating lease, liability noncurrent extensible list | us-gaap:OtherLiabilitiesNoncurrent | us-gaap:OtherLiabilitiesNoncurrent
Financing, non current | $ 314 | $ 323
Financing lease, liability noncurrent extensible list | us-gaap:LongTermDebtAndCapitalLeaseObligations | us-gaap:LongTermDebtAndCapitalLeaseObligations
Total lease liabilities | $ 880 | $ 804

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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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