Income Taxes (Schedule of Difference in Income Tax Effects Comprising Company's Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Inventories	$ 480	$ 583
Product-related liabilities	34	115
Other accrued expenses	204	248
State income taxes	46	52
Share-based compensation	46	80
Net operating loss carryforwards	52	74
Other	105	117
Total deferred income tax assets	967	1,269
Less valuation allowances	(49)	(51)
Net deferred income tax assets	918	1,218
Deferred income tax liabilities:
Depreciation and amortization	(598)	(871)
Undistributed earnings	(81)	(50)
Other	(3)	(50)
Total deferred income tax liabilities	(682)	(971)
Net deferred income tax assets	236	247
Noncurrent assets—Other	283	302
Noncurrent liabilities—Other liabilities	$ (47)	$ (55)