Income Taxes (Deferred Income Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Allowance for doubtful accounts	$ 19	$ 24
Inventories	93	99
Pension and postretirement benefits	105	259
Environmental and regulatory compliance	38	27
Other accruals and prepayments	348	341
Stock-based compensation expense	76	68
Operating lease liabilities	252	215
Tax credit and loss carryforwards	544	569
Valuation allowances	(242)	(264)
Total deferred tax asset	1,233	1,338
Deferred tax liabilities:
Property, plant and equipment	(79)	(50)
Insurance, including self-insurance	(520)	(713)
Basis difference in LYONs	0	(11)
Operating lease right-of-use assets	(235)	(204)
Goodwill and other intangibles	(3,962)	(3,814)
Total deferred tax liability	(4,796)	(4,792)
Net deferred tax liability	$ (3,563)	$ (3,454)