Employee Benefit Plans - Net Periodic Benefit Cost (Credit) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Domestic pension benefits
Components of net periodic benefit cost (credit):
Service cost	$ 14	$ 16
Interest cost	45	43
Expected return on assets	(79)	(73)
Other	28	47
Net periodic benefit cost (credit)	8	33
Foreign pension benefits
Components of net periodic benefit cost (credit):
Service cost	9	9
Interest cost	11	10
Expected return on assets	(15)	(12)
Other	4	4
Net periodic benefit cost (credit)	9	11
Health care benefits
Components of net periodic benefit cost (credit):
Service cost	1	1
Interest cost	3	2
Expected return on assets	(2)	(2)
Other	0	1
Net periodic benefit cost (credit)	$ 2	$ 2