Pension and Other Postretirement Healthcare Benefits - Summary of Fair Value of Pension Investments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2010 U.S. Level 3 Assets [Member]	Dec. 31, 2012 U.S. Pension [Member]	Dec. 31, 2011 U.S. Pension [Member]	Dec. 31, 2012 U.S. Pension [Member] Corporate [Member]	Dec. 31, 2011 U.S. Pension [Member] Corporate [Member]	Dec. 31, 2012 U.S. Pension [Member] Government [Member]	Dec. 31, 2011 U.S. Pension [Member] Government [Member]	Dec. 31, 2012 U.S. Pension [Member] Mortgages [Member]	Dec. 31, 2011 U.S. Pension [Member] Mortgages [Member]	Dec. 31, 2012 U.S. Pension [Member] International Commingled Fixed Income Funds [Member]	Dec. 31, 2011 U.S. Pension [Member] International Commingled Fixed Income Funds [Member]	Dec. 31, 2012 U.S. Pension [Member] Commingled Cash Equivalents Fund [Member]	Dec. 31, 2011 U.S. Pension [Member] Commingled Cash Equivalents Fund [Member]	Dec. 31, 2011 U.S. Pension [Member] U S Mutual Funds [Member]	Dec. 31, 2011 U.S. Pension [Member] Asset backed [Member]	Dec. 31, 2012 U.S. Pension [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2011 U.S. Pension [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2012 U.S. Pension [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government [Member]	Dec. 31, 2011 U.S. Pension [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government [Member]	Dec. 31, 2011 U.S. Pension [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] U S Mutual Funds [Member]	Dec. 31, 2012 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate [Member]	Dec. 31, 2011 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate [Member]	Dec. 31, 2012 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Government [Member]	Dec. 31, 2011 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Government [Member]	Dec. 31, 2012 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Mortgages [Member]	Dec. 31, 2011 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Mortgages [Member]	Dec. 31, 2012 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] International Commingled Fixed Income Funds [Member]	Dec. 31, 2011 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] International Commingled Fixed Income Funds [Member]	Dec. 31, 2012 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Commingled Cash Equivalents Fund [Member]	Dec. 31, 2011 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Commingled Cash Equivalents Fund [Member]	Dec. 31, 2011 U.S. Pension [Member] Significant Other Observable Inputs (Level 2) [Member] Asset backed [Member]	Dec. 31, 2012 U.S. Pension [Member] Commingled Equity Fund [Member]	Dec. 31, 2012 U.S. Pension [Member] Commingled Equity Fund [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 U.S. Pension [Member] Equity securities [Member]	Dec. 31, 2011 U.S. Pension [Member] Equity securities [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2012 Netherlands Plan [Member]	Dec. 31, 2011 Netherlands Plan [Member]	Dec. 31, 2012 Netherlands Plan [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Netherlands Plan [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Netherlands Plan [Member] Equity securities [Member]	Dec. 31, 2011 Netherlands Plan [Member] Equity securities [Member]	Dec. 31, 2012 Netherlands Plan [Member] Equity securities [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Netherlands Plan [Member] Equity securities [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Netherlands Plan [Member] Debt securities [Member]	Dec. 31, 2011 Netherlands Plan [Member] Debt securities [Member]	Dec. 31, 2012 Netherlands Plan [Member] Debt securities [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Netherlands Plan [Member] Debt securities [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Netherlands Plan [Member] Cash and cash equivalents [Member]	Dec. 31, 2012 Netherlands Plan [Member] Cash and cash equivalents [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Netherlands Plan [Member] Real estate [Member]	Dec. 31, 2011 Netherlands Plan [Member] Real estate [Member] Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair values of pension investments			$ 259	$ 8	$ 13	$ 12	$ 11	$ 16	$ 24	$ 137	$ 3	$ 3	$ 8	$ 52	$ 1		$ 209	$ 11	$ 10	$ 52		$ 50	$ 8	$ 13	$ 1	$ 1	$ 16	$ 24	$ 137	$ 3	$ 3	$ 8	$ 1	$ 110	$ 110	$ 147	$ 147
Fair Value measurement of Non-US Pooled Funds	$ 22	$ 286														$ 11					$ 275																	$ 112	$ 91	$ 112	$ 91	$ 46	$ 37	$ 46	$ 37	$ 60	$ 46	$ 60	$ 46	$ 6	$ 6	$ 8	$ 8

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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