Employee Benefit Plans (Change in Accumulated Other Comprehensive Loss (Pretax) Relating to Defined Benefit Pension and Other Postretirement Benefits) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	$ 277
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	17
New prior service cost (credit)	(305)
Amortization of actuarial loss	(19)
Amortization of prior service cost	31
Foreign currency translation adjustments	0
Plan settlements	0
Impact of flat glass transaction	0
Net change	(276)
Pensions
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	260
New prior service cost (credit)	16
Amortization of actuarial loss	(110)
Amortization of prior service cost	1
Foreign currency translation adjustments	(23)
Plan settlements	(1,063)
Impact of flat glass transaction	16
Net change	(935)
Pensions | Pensions
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ (1)	$ (2)	$ (2)