Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities
Property, plant, and equipment	$ 903	$ 1,012
Deferred Tax Liabilities, Intangible Assets	334	286
Deferred Tax Liabilities, Leasing Arrangements	223	220
Equity in earnings of affiliates	64	72
Deferred Tax Liabilities, Inventory	25	32
Debt exchange	53	80
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals	195	20
Other	173	109
Deferred Tax Liabilities, Gross	1,970	1,831
Deferred tax assets
Pension and postretirement benefits	163	155
Deferred tax assets, leasing arrangements	227	225
Stock compensation	80	62
Foreign tax loss carryforwards	470	411
Capital loss carryforwards	70	62
State tax attributes	79	74
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	42	0
Other	136	147
Gross deferred tax assets	1,267	1,136
Valuation allowances	(339)	(325)
Net deferred tax assets	928	811
Deferred Tax Liabilities, Net, Classification [Abstract]
Net deferred tax liabilities	(1,042)	(1,020)
Domestic Tax Authority [Member]
Deferred tax liabilities
Deferred Tax Liabilities, Gross	957	969
Foreign [Member]
Deferred tax liabilities
Deferred Tax Liabilities, Gross	345	225
Deferred tax assets
Net deferred tax assets	$ 260	$ 174