Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 202
Estimated future employer contributions for remainder of the year	8
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	116
Estimated future employer contributions for remainder of the year	$ 203