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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

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