(Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Income Tax Disclosure [Abstract] | ||
| Postretirement benefit accruals | $ 90 | $ 89 |
| Pension obligations | 421 | 465 |
| Tax credits | 290 | 291 |
| Net operating and capital loss carryforwards | 621 | 594 |
| Compensation reserves | 181 | 191 |
| Lease obligations | 106 | 0 |
| Environmental reserves | 93 | 78 |
| Other | 126 | 86 |
| Gross deferred income tax assets | 1,928 | 1,794 |
| Less: valuation allowance (a) | (691) | (441) |
| Net deferred income tax asset | 1,237 | 1,353 |
| Intangibles | (152) | (152) |
| Investments | (265) | (255) |
| Right of use assets | (106) | 0 |
| Plants, properties and equipment | (1,866) | (1,826) |
| Forestlands, related installment sales, and investment in subsidiary | (1,407) | (1,453) |
| Gross deferred income tax liabilities | (3,796) | (3,686) |
| Net deferred income tax liability | $ (2,559) | $ (2,333) |