Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Deferred tax assets: | ||
| Receivables | $ 79 | $ 117 |
| Inventory | 91 | 79 |
| Property | 137 | 191 |
| Goodwill and other intangibles | 117 | 132 |
| Employee benefits | 98 | 97 |
| Investment in partnership | 381 | 228 |
| Other accrued expenses | 47 | 74 |
| Operating loss carryforwards | 1,654 | 1,525 |
| Tax credit carryforwards | 941 | 653 |
| Other | 270 | 232 |
| Total deferred income tax asset | 3,815 | 3,328 |
| Valuation allowances | (2,883) | (2,372) |
| Total deferred income tax asset after valuation allowance | 932 | 956 |
| Deferred tax liabilities: | ||
| Undistributed earnings of foreign subsidiaries | 0 | (9) |
| Other | (29) | (18) |
| Total deferred income tax liability | (29) | (27) |
| Net deferred tax asset | $ 903 | $ 929 |