Net Periodic Benefit Cost (Credit) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 15	$ 15	$ 16	$ 30	$ 32
Interest cost	42	42	44	84	88
Expected return on assets	(68)	(68)	(71)	(136)	(141)
Other	38	38	23	76	46
Net periodic benefit cost	27	27	12	54	25
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	8	8	16	16
Interest cost	9	9	9	18	17
Expected return on assets	(12)	(12)	(11)	(24)	(22)
Other	3	3	4	6	8
Net periodic benefit cost	8	8	10	16	19
Health Care Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	2	2
Interest cost	3	3	3	6	6
Expected return on assets	(2)	(2)	(2)	(4)	(4)
Other	3	3	2	6	4
Net periodic benefit cost	$ 5	$ 5	$ 4	$ 10	$ 8