Income Taxes (Net Deferred Income Tax Assets and Liabilities) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Valuation Allowances and Reserves, Balance	$ 119	$ 139
Undistributed Earnings of Foreign Subsidiaries	5,300	5,000
Deferred income tax assets related to
Employee benefits	604	730
Contingent and accrued liabilities	263	604
Operating loss and other carry-forwards	197	361
Inventories	17	20
Property	49	47
Other	100	98
Valuation allowance	(119)	(139)
Total	1,111	1,721
Deferred income tax liabilities related to
Property	382	580
Intangibles	647	439
Employee benefits	4	67
Derivatives	6	4
Undistributed foreign earnings	189	158
Other	146	222
Total	1,374	1,470
Deferred income tax (liabilities) assets – net	$ (263)
Deferred income tax (liabilities) assets – net		251
Minimum
Income Tax Examination [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2016
Tax Credit Carryforward, Expiration Date	Dec. 31, 2016
Maximum
Income Tax Examination [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2028
Tax Credit Carryforward, Expiration Date	Dec. 31, 2025
Undistributed earnings, permanently reinvested [Member]
Income Tax Examination [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 3,500	$ 4,200