Employee Benefit Plans (Change in Accumulated Other Comprehensive Loss (Pretax) Relating to Defined Benefit Pension and Other Postretirement Benefits) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	$ 125
Impact of curtailments	0
Amortization of actuarial loss	(11)
Amortization of prior service cost	10
Foreign currency translation adjustments and other	(1)
Net change	123
Pensions
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	494
Impact of curtailments	(11)
Amortization of actuarial loss	(77)
Amortization of prior service cost	2
Foreign currency translation adjustments and other	(34)
Net change	374
Pensions | Pensions
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ (2)	$ (2)