Income Taxes (Schedule of Difference in Income Tax Effects Comprising Company's Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Inventories	$ 415	$ 390
Product-related liabilities	57	60
Other accrued expenses	221	222
Depreciation and amortization	1,363	1,504
State income taxes	65	70
Share-based compensation	49	47
Net operating loss carryforwards	95	134
Other	207	177
Total deferred income tax assets	2,472	2,604
Less valuation allowances	(75)	(66)
Net deferred income tax assets	2,397	2,538
Deferred income tax liabilities:
Depreciation and amortization	(893)	(865)
Undistributed earnings	(37)	(46)
Other	0	(3)
Total deferred income tax liabilities	(930)	(914)
Net deferred income tax assets	1,467	1,624
Noncurrent deferred income tax assets	1,575	1,678
Noncurrent liabilities—Other liabilities	$ (108)	$ (54)