Employee Benefit Plans- Net Periodic Benefit Cost (Credit) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Domestic pension benefits
Components of net periodic benefit cost (credit):
Service cost	$ 16	$ 16	$ 15	$ 48	$ 45
Interest cost	43	43	42	129	126
Expected return on assets	(73)	(73)	(68)	(219)	(204)
Other	49	46	38	142	114
Net periodic benefit cost	35	32	27	100	81
Foreign pension benefits
Components of net periodic benefit cost (credit):
Service cost	9	9	8	27	24
Interest cost	10	10	9	30	27
Expected return on assets	(12)	(12)	(12)	(36)	(36)
Other	3	4	4	11	10
Net periodic benefit cost	10	11	9	32	25
Health care benefits
Components of net periodic benefit cost (credit):
Service cost	1	1	1	3	3
Interest cost	2	2	3	6	9
Expected return on assets	(2)	(2)	(2)	(6)	(6)
Other	1	1	3	3	9
Net periodic benefit cost	$ 2	$ 2	$ 5	$ 6	$ 15