Employee Benefit Plans - Net Periodic Benefit Cost (Credit) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Domestic pension benefits
Components of net periodic benefit cost (credit):
Service cost	$ 14	$ 14	$ 16	$ 42	$ 48
Interest cost	45	45	43	135	129
Expected return on assets	(79)	(79)	(73)	(237)	(219)
Other	28	30	49	86	142
Net periodic benefit cost	8	10	35	26	100
Foreign pension benefits
Components of net periodic benefit cost (credit):
Service cost	9	9	9	27	27
Interest cost	11	11	10	33	30
Expected return on assets	(15)	(15)	(12)	(45)	(36)
Other	4	4	3	12	11
Net periodic benefit cost	9	9	10	27	32
Health care benefits
Components of net periodic benefit cost (credit):
Service cost	1	1	1	3	3
Interest cost	3	3	2	9	6
Expected return on assets	(2)	(2)	(2)	(6)	(6)
Other	0	0	1	0	3
Net periodic benefit cost	$ 2	$ 2	$ 2	$ 6	$ 6