| **Pension and Postretirement Benefit Plans and Defined Contribution Plans - Amounts Expected to be Amortized into Net Periodic Benefit Costs (Detail) $ in Millions** | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| U.S. Qualified Pension Plans [Member]                                                                                                                                 |            |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                      |            |
| Actuarial losses                                                                                                                                                      | $ (398)         |
| Prior service credits and other                                                                                                                                       | (5)             |
| Total                                                                                                                                                                 | (403)           |
| U.S. Supplemental (Non-Qualified) Pension Plans [Member]                                                                                                              |            |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                      |            |
| Actuarial losses                                                                                                                                                      | (37)            |
| Prior service credits and other                                                                                                                                       | 1               |
| Total                                                                                                                                                                 | (36)            |
| International Pension Plans [Member]                                                                                                                                  |            |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                      |            |
| Actuarial losses                                                                                                                                                      | (91)            |
| Prior service credits and other                                                                                                                                       | 2               |
| Total                                                                                                                                                                 | (89)            |
| Postretirement Plans [Member]                                                                                                                                         |            |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                      |            |
| Actuarial losses                                                                                                                                                      | (29)            |
| Prior service credits and other                                                                                                                                       | 164             |
| Total                                                                                                                                                                 | $ 135           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
+ Details**Name:**us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                    |
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| X                                                                                                                                                                                                     |
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| X                                                                                                                                                                                                                 |
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