| **Tax Matters (Detail) - USD ($) $ in Millions**                                                                                                                                                                                                                                              | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Income Tax Disclosure [Abstract]**                                                                                                                                                                                                                                                          |                |   |   |
| Foreign currency translation adjustments, net                                                                                                                                                                                                                                                 | [1]            | $ (21) | $ (14) |
| Unrealized holding gains/(losses) on derivative financial instruments, net                                                                                                                                                                                                                    |                | 3 | (36) |
| Reclassification adjustments for realized gains                                                                                                                                                                                                                                               |                | (52) | (72) |
| Derivatives qualifying as hedges, tax, total                                                                                                                                                                                                                                                  |                | (49) | (108) |
| Unrealized holding gains on available-for-sale securities, net                                                                                                                                                                                                                                |                | 38 | 17 |
| Reclassification adjustments for realized losses                                                                                                                                                                                                                                              |                | 11 | 26 |
| Available-for-sale securities, tax, total                                                                                                                                                                                                                                                     |                | 48 | 43 |
| Benefit plans: actuarial gains, net                                                                                                                                                                                                                                                           |                | 0 | 0 |
| Reclassification adjustments related to amortization                                                                                                                                                                                                                                          |                | 50 | 47 |
| Reclassification adjustments related to settlements, net                                                                                                                                                                                                                                      |                | 12 | 9 |
| Other                                                                                                                                                                                                                                                                                         |                | 5 | (1) |
| Defined benefit plans, actuarial gain (loss), tax, total                                                                                                                                                                                                                                      |                | 66 | 55 |
| Benefit plans: prior service costs and other, net                                                                                                                                                                                                                                             |                | 0 | 0 |
| Reclassification adjustments related to amortization                                                                                                                                                                                                                                          |                | (17) | (15) |
| Reclassification adjustments related to curtailments, net                                                                                                                                                                                                                                     |                | (3) | (2) |
| Other                                                                                                                                                                                                                                                                                         |                | 0 | 1 |
| Pension and other postretirement benefit plans, net prior service cost (credit), tax                                                                                                                                                                                                          |                | (19) | (16) |
| Tax provision/(benefit) on other comprehensive income/(loss)                                                                                                                                                                                                                                  | [2],[3]        | $ 25 | $ (41) |
|                                                                                                                                                                                                                                                                                               |
| [1]Taxes are not provided for foreign currency translation adjustments relating to investments in international subsidiaries that will be held indefinitely.[2]Amounts may not add due to rounding.[3]See Note 5C. Tax Matters: Tax Provision/(Benefit) on Other Comprehensive Income/(Loss). |

| X                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), Tax
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Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit) And Other, Tax
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Other Comprehensive (Income) Loss, Curtailment Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax
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Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Other Net Prior Service Cost (Credit) Arising During Period, Tax
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Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Other Net Unamortized Gain (Loss) Arising During Period, Tax
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| - Definition
Other Comprehensive Income (Loss), Settlement Adjustment From AOCI, Pension And Other Postretirement Benefit Plans, for Net Gain (Loss), Tax
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| - Definition
Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax (expense) benefit related to cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).
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| - Definition
Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).
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| - Definition
Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.
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| - Definition
Amount of tax expense (benefit) allocated to other comprehensive income (loss).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.
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