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Income Taxes (Tax Effects of Temporary Differences and Carryforwards of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Income Taxes [Abstract] |  |
Loss and tax credit carryforwards | $ 479 | $ 652
Other assets | 45 | 43
Asset impairments and restructuring reserves | 33 | 94
Postretirement medical and life benefits | 162 | 191
Other accrued liabilities | 265 |
Other employee benefits | 289 | 278
Gross deferred tax assets | 1,273 | 1,258
Valuation allowance | (317) | (456)
Total deferred tax assets | 956 | 802
Intangible and other assets | (96) | (101)
Other accrued liabilities |  | (94)
Fixed assets | (256) | (245)
Total deferred tax liabilities | (352) | (440)
Net deferred tax assets | $ 604 | $ 362

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