Summary of Amounts Reclassification from AOCI to Net Income (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification for the period, net of tax	[1],[2]	$ (25)	$ 3,369
Other expense (income), net		(2)	3,169
Cost of sales		1,433	1,410
Reclassifications, Total before tax		328	3,329
Reclassifications, Tax expense (benefit)		(55)	58
Net income		272	3,380
Actuarial losses and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of pension and other employee benefits items, reclassifications, Total before tax	[1],[3]	(34)	(33)
Amortization of pension and other employee benefits items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of pension and other employee benefits items, reclassifications, Total before tax	[1]	(34)	(33)
Amortization of pension and other employee benefits items, reclassifications, Tax benefit	[1]	11	11
Total reclassification for the period, net of tax	[1],[2]	(23)	(22)
Gains on hedging activities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification for the period, net of tax	[2]	1	3
Gains on hedging activities | Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, Total before tax	[1]	2	5
Reclassifications, Tax expense (benefit)	[1]	(1)	(2)
Net income	[1]	1	3
Gains on hedging activities | Interest rate contracts | Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	[1]		4
Gains on hedging activities | Foreign exchange contract | Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	[1]	2	1
Gains on sale of equity securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification for the period, net of tax	[2]	(3)	3,388
Gains on sale of equity securities | Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	[1]		3,388
Other-than-temporary impairment of equity securities | Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	[1]	(4)
Available-for-sale-securities | Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, Tax expense (benefit)	[1]	1
Net income	[1]	(3)	3,388
Reclassifications, Total before tax	[1]	$ (4)	$ 3,388

[1] Amounts in parentheses indicate reductions to net income.

[2] See table below for details about these reclassifications.

[3] These AOCI components are included in the computation of net periodic benefit cost disclosed in Note 10.