| **Tax Matters (Detail) - USD ($) $ in Millions**                                                                                                                                                    | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Income Tax Disclosure [Abstract]**                                                                                                                                                                |                |   |   |
| Foreign currency translation adjustments, net                                                                                                                                                       | [1]            | $ (252) | $ 27 |
| Unrealized holding gains/(losses) on derivative financial instruments, net                                                                                                                          |                | (133) | 59 |
| Reclassification adjustments for (gains)/losses included in net income                                                                                                                              |                | 15 | (55) |
| Derivatives qualifying as hedges, tax, total                                                                                                                                                        |                | (118) | 4 |
| Unrealized holding gains/(losses) on available-for-sale securities, net                                                                                                                             |                | (6) | 5 |
| Reclassification adjustments for losses included in net income                                                                                                                                      |                | 2 | 1 |
| Available-for-sale securities, tax, total                                                                                                                                                           |                | (5) | 7 |
| Benefit plans: actuarial losses, net                                                                                                                                                                |                | (21) | 0 |
| Reclassification adjustments related to amortization                                                                                                                                                |                | 15 | 3 |
| Reclassification adjustments related to settlements, net                                                                                                                                            |                | 9 | 0 |
| Other                                                                                                                                                                                               |                | 4 | (5) |
| Defined benefit plans, actuarial gain (loss), tax, total                                                                                                                                            |                | 8 | (2) |
| Reclassification adjustments related to amortization of prior service costs and other, net                                                                                                          |                | (11) | (11) |
| Other                                                                                                                                                                                               |                | 0 | 0 |
| Pension and other postretirement benefit plans, net prior service cost (credit), tax                                                                                                                |                | (11) | (11) |
| Tax provision/(benefit) on other comprehensive income/(loss)                                                                                                                                        | [2]            | $ (377) | $ 25 |
|                                                                                                                                                                                                     |
| [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. |

| X                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), 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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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) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, 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) loss for prior service cost (credit) of defined benefit plan.
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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, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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| - Definition
Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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| - Definition
Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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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 for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, 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 (loss) for gain (loss) of defined benefit plan.
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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 of unrealized holding gain (loss) on available-for-sale securities.
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