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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