Summary of Amounts Reclassified from AOCI to Net Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013		Sep. 30, 2013
Other Comprehensive Income (Loss) [Line Items]
Amortization of pension and other employee benefits items Actuarial losses and other reclassified from AOCI to net income, before tax	$ (64)	[1]	$ (191)	[1]
Amortization of pension and other employee benefits items Actuarial losses and other reclassified from AOCI to net income, tax benefit	23	[1]	67	[1]
Amortization of pension and other employee benefits items Actuarial losses and other reclassified from AOCI to net income, Net of tax	(41)	[1]	(124)	[1]
Gain (Loss) on hedging activities reclassified from AOCI to net income, before tax	8	[1]	36	[1]
Gain on hedging activities reclassified from AOCI to net income, tax expense	(3)	[1]	(13)	[1]
Gain on hedging activities reclassified from AOCI to net income, Net of tax	5	[1]	23	[1],[2]
Total reclassification for the period	(36)	[1]	(101)	[1]
Interest Rate Contract | Interest Expense
Other Comprehensive Income (Loss) [Line Items]
Gain (Loss) on hedging activities reclassified from AOCI to net income, before tax	(1)	[1]	10	[1]
Foreign Exchange Contract | Net Sales
Other Comprehensive Income (Loss) [Line Items]
Gain (Loss) on hedging activities reclassified from AOCI to net income, before tax			(1)	[1]
Foreign Exchange Contract | Cost of Revenue
Other Comprehensive Income (Loss) [Line Items]
Gain (Loss) on hedging activities reclassified from AOCI to net income, before tax	9	[1]	27	[1]
Actuarial losses and other
Other Comprehensive Income (Loss) [Line Items]
Amortization of pension and other employee benefits items Actuarial losses and other reclassified from AOCI to net income, before tax	$ (64)	[1],[3]	$ (191)	[1],[3]

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

[2] See table below for details about the reclassifications for the nine months ended September 30, 2013.

[3] These AOCI components are included in the computation of net periodic benefit cost disclosed in Note 9.