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Income Taxes Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax assets:    
Net operating loss carryforwards $ 173 $ 236
Tax credit carryforwards 29 24
Accrued liabilities and deferred income 77 92
Operating leases 169 0
Minimum pension obligations 18 16
Provision for doubtful accounts 7 7
Liability for unrecognized tax benefits 1 1
Interest rate swaps 12 5
Total deferred tax assets 486 381
Less: valuation allowance (14) (14)
Total deferred income tax assets after valuation allowance 472 367
Deferred income tax liabilities:    
Depreciation and amortization 704 747
Operating leases 146 0
Prepaid expenses 8 8
Basis difference in investment in joint ventures 2 1
Other 2 0
Total deferred tax liabilities 862 756
Deferred Tax Assets, Net, Classification [Abstract]    
Net deferred income tax liabilities (390) $ (389)
Operating Loss Carryforwards $ 588