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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Tax benefit of loss carryforwards $ 735 $ 622
Operating lease liabilities 469 452
Liabilities currently not deductible for tax 259 234
Unrealized loss on foreign exchange hedges and retirement liabilities 87 69
Tax credit carryforwards 64 70
Others 46 41
Deferred tax assets, Gross, Total 1,660 1,488
Valuation allowance against tax benefit of loss carryforwards (569) (515)
Other valuation allowance (206) (170)
Deferred tax assets, Net, Total 885 803
Operating lease right-of-use assets 470 447
Tax depreciation in excess of book depreciation 239 242
Tax on undistributed foreign earnings 163 137
Other assets book value in excess of tax values 65 66
Unrealized gain on foreign exchange hedges and retirement liabilities 17 18
Unrealized gain on remeasurement of investments 11 4
Deferred tax liabilities, Total 965 914
Net deferred tax liabilities $ (80) $ (111)