Income Taxes (Net Deferred Income Tax Assets and Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred income tax assets related to
Employee benefits	$ 706	$ 1,000
Contingent and accrued liabilities	613	598
Operating loss and other carry-forwards	269	223
Inventories	31	21
Property	4	5
Derivatives	0	38
Other	47	41
Valuation allowance	(136)	(138)
Total	1,534	1,788
Deferred income tax liabilities related to
Property	310	405
Intangibles	450	452
Employee benefits	55	69
Deferred Tax Liabilities, Derivatives	41
Other	21	3
Total	877	929
Deferred income tax assets – net	$ 657	$ 859