Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 15	$ 16
Interest cost	42	44
Expected return on assets	(68)	(70)
Other	38	23
Net periodic benefit cost	27	13
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	8
Interest cost	9	8
Expected return on assets	(12)	(11)
Other	3	4
Net periodic benefit cost	8	9
Health Care Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	3	3
Expected return on assets	(2)	(2)
Other	3	2
Net periodic benefit cost	$ 5	$ 4