Pensions and Other Post-Retirement Benefits - Assets at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	$ 1,384	$ 1,574	$ 1,588
Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	219	316
Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	1,002	1,131
Level 3
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	163	127
Cash and equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	8	38
Cash and equivalents | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	8	37
Cash and equivalents | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value		1
Equity securities - U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	92	93
Equity securities - U.S. | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	25	80
Equity securities - U.S. | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	67	13
Equity securities - Global
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	219	296
Equity securities - Global | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	5	4
Equity securities - Global | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	214	292
Equity securities – non-U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	192	200
Equity securities – non-U.S. | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	23	29
Equity securities – non-U.S. | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	169	171
Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	33	39
Real estate | Level 3
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	33	39
Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	514	524
Corporate bonds | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	104	111
Corporate bonds | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	410	413
Debt issued by national, state or local government
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	182	280
Debt issued by national, state or local government | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	54	55
Debt issued by national, state or local government | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	128	225
Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	144	104
Other | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	14	16
Other | Level 3
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	$ 130	$ 88