| **Pension and Postretirement Benefit Plans and Defined Contribution Plans - Long-term Target Asset Allocations Ranges and the Percentage of the Fair Value of Plan Assets (Detail)** | 12 Months Ended |         |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|---------|
||
| U.S. Qualified Pension Plans [Member]                                                                                                                                                |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Defined Benefit Plan, Target Plan Asset Allocations                                                                                                                                  | 100.00%         |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 100.00%         | 100.00% |
| U.S. Qualified Pension Plans [Member] | Cash and Cash Equivalents [Member]                                                                                                           |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 0.00%           |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 10.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 2.80%           | 2.90%   |
| U.S. Qualified Pension Plans [Member] | Equity Securities [Member]                                                                                                                   |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 35.00%          |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 55.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 51.50%          | 45.90%  |
| U.S. Qualified Pension Plans [Member] | Debt Securities [Member]                                                                                                                     |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 30.00%          |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 55.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 30.70%          | 35.50%  |
| U.S. Qualified Pension Plans [Member] | Real Estate Investment [Member]                                                                                                              |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 5.00%           |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 18.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 15.00%          | 15.70%  |
| International Pension Plans [Member]                                                                                                                                                 |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Defined Benefit Plan, Target Plan Asset Allocations                                                                                                                                  | 100.00%         |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 100.00%         | 100.00% |
| International Pension Plans [Member] | Cash and Cash Equivalents [Member]                                                                                                            |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 0.00%           |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 10.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 2.80%           | 3.90%   |
| International Pension Plans [Member] | Equity Securities [Member]                                                                                                                    |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 35.00%          |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 55.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 51.90%          | 51.60%  |
| International Pension Plans [Member] | Debt Securities [Member]                                                                                                                      |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 30.00%          |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 55.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 29.00%          | 31.00%  |
| International Pension Plans [Member] | Real Estate Investment [Member]                                                                                                               |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 5.00%           |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 18.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 16.30%          | 13.50%  |
| Postretirement Plans [Member]                                                                                                                                                        |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Defined Benefit Plan, Target Plan Asset Allocations                                                                                                                                  | 100.00%         |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 100.00%         | 100.00% |
| Postretirement Plans [Member] | Cash and Cash Equivalents [Member]                                                                                                                   |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 0.00%           |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 5.00%           |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 4.00%           | 4.40%   |
| Postretirement Plans [Member] | Equity Securities [Member]                                                                                                                           |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 10.00%          |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 35.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 21.70%          | 20.10%  |
| Postretirement Plans [Member] | Debt Securities [Member]                                                                                                                             |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 5.00%           |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 30.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 13.00%          | 15.50%  |
| Postretirement Plans [Member] | Real Estate Investment [Member]                                                                                                                      |            |    |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                     |            |    |
| Equity and debt securities, target allocation percentage, minimum                                                                                                                    | 55.00%          |    |
| Equity and debt securities, target allocation percentage, maximum                                                                                                                    | 70.00%          |    |
| Equity securities, percentage of plan assets                                                                                                                                         | 61.30%          | 60.00%  |

| X                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| - Definition
Target allocation of investments of this type to total plan assets presented on a weighted average basis.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.
+ References
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