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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Operating loss carryforwards $ 2,255 $ 2,249
Tax credit carryforwards 1,183 1,083
Investment in partnership 457 160
Property 156 127
Employee benefits 116 138
Goodwill and other intangibles 97 143
Receivables 72 53
Inventory 61 51
Other 153 264
Total deferred income tax asset 4,550 4,268
Valuation allowances (3,928) (3,472)
Total deferred income tax asset after valuation allowance 622 796
Deferred tax liabilities:    
Other (14) (29)
Total deferred income tax liability (14) (29)
Net deferred tax asset $ 608 $ 767