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Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (2,399)
Net other comprehensive income (loss) after tax in respect of actuarial benefits		$ (428)
Ending Balance	(2,446)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,919)	(1,794)
Other comprehensive income (loss) before reclassifications	(77)	(432)
Net other comprehensive income (loss) before tax	(77)	(432)
Corresponding income tax	15	4
Net other comprehensive income (loss) after tax in respect of actuarial benefits	(62)
Ending Balance	(1,981)	(2,222)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(363)	(420)
Other comprehensive income (loss) before reclassifications		19
Amounts reclassified to the statements of income	18	18
Net other comprehensive income (loss) before tax	18	37
Corresponding income tax	(4)
Net other comprehensive income (loss) after tax in respect of actuarial benefits	14	37
Ending Balance	(349)	(383)
Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(117)	(98)
Amounts reclassified to the statements of income	1
Net other comprehensive income (loss) before tax	1
Net other comprehensive income (loss) after tax in respect of actuarial benefits	1
Ending Balance	(116)	(98)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,399)	(2,312)
Other comprehensive income (loss) before reclassifications	(77)	(413)
Amounts reclassified to the statements of income	19	18
Net other comprehensive income (loss) before tax	(58)	(395)
Corresponding income tax	11	4
Net other comprehensive income (loss) after tax in respect of actuarial benefits	(47)	(391)
Ending Balance	$ (2,446)	$ (2,703)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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