Pensions and Other Post-Retirement Benefits - Assets at Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	$ 1,574	$ 1,588	$ 1,441
Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	316	283
Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	1,131	1,185
Level 3
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	127	120
Cash and equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	38	19
Cash and equivalents | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	37	15
Cash and equivalents | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	1	4
Equity securities - U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	93	152
Equity securities - U.S. | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	80	80
Equity securities - U.S. | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	13	72
Equity securities - Global
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	296	198
Equity securities - Global | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	4	7
Equity securities - Global | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	292	191
Equity securities – non-U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	200	287
Equity securities – non-U.S. | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	29	31
Equity securities – non-U.S. | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	171	256
Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	39	39
Real estate | Level 3
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	39	39
Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	524	545
Corporate bonds | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	111	104
Corporate bonds | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	413	441
Debt issued by national, state or local government
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	280	247
Debt issued by national, state or local government | Level 1
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	55	46
Debt issued by national, state or local government | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	225	201
Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	104	101
Other | Level 2
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	16	20
Other | Level 3
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Total Assets at Fair Value	$ 88	$ 81