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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Net operating loss carryforward $ 105 $ 209
Credit carryforward 25 25
Operating lease liabilities 113 96
Accruals 63 65
Pension 90 83
Inventories 13 20
Other 43 26
Deferred taxes assets—total 452 524
Property, plant and equipment (1,080) (1,017)
Intangibles (137) (156)
Operating lease right-of-use asset (112) (95)
Turnaround costs (17) (21)
Consolidated partnerships (181) (194)
Equity method investments (227) (220)
Other (18) (18)
Deferred tax liabilities—total (1,772) (1,721)
Valuation allowance (33) (30)
Total net deferred tax liabilities (1,353) (1,227)
Balance sheet classifications    
Noncurrent deferred tax asset 15 28
Noncurrent deferred tax liability $ (1,368) $ (1,255)