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Income Taxes Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Net operating loss carryforwards $ 124 $ 177
Tax credit carryforwards 26 29
Accrued liabilities and deferred income 88 77
Operating leases 151 169
Minimum pension obligations 19 18
Provision for doubtful accounts 9 7
Liability for unrecognized tax benefits 1 1
Interest rate swaps 21 12
Total deferred tax assets 439 490
Less: valuation allowance (21) (17)
Total deferred income tax assets after valuation allowance 418 473
Deferred income tax liabilities:    
Depreciation and amortization 553 704
Operating leases 119 146
Prepaid expenses 9 8
Basis difference in investment in joint ventures 11 2
Other 1 2
Total deferred tax liabilities 693 862
Deferred Tax Assets, Net, Classification [Abstract]    
Net deferred income tax liabilities (275) (389)
Deferred Income Tax Liabilities, Net 276 $ 390
Deferred Tax Assets, Net 1  
Operating Loss Carryforwards $ 368