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Equity - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 17,359
Ending Balance	14,707	$ 17,359
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,316)	(2,769)	$ (2,384)
Other comprehensive income/(loss) before reclassifications	(739)	1,075	(355)
Amounts reclassified to the statements of income		378	3
Net other comprehensive income/(loss) before tax	(739)	1,453	(352)
Corresponding income tax			(33)
Net other comprehensive income/(loss) after tax	(739)	1,453	(385)
Ending Balance	(2,055)	(1,316)	(2,769)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(4)	(7)	312
Cumulative effect of new accounting standard (See Note 1)	5
Other comprehensive income/(loss) before reclassifications	(1)	64	(456)
Amounts reclassified to the statements of income	1	(66)	140
Net other comprehensive income/(loss) before tax		(2)	(316)
Corresponding income tax		5	(3)
Net other comprehensive income/(loss) after tax		3	(319)
Ending Balance	1	(4)	(7)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(442)	(302)	175
Other comprehensive income/(loss) before reclassifications	87	(167)	(491)
Amounts reclassified to the statements of income	28	27	14
Net other comprehensive income/(loss) before tax	115	(140)	(477)
Net other comprehensive income/(loss) after tax	115	(140)	(477)
Ending Balance	(327)	(442)	(302)
Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(91)	(81)	(58)
Other comprehensive income/(loss) before reclassifications	4	(3)	(26)
Amounts reclassified to the statements of income	13	(5)	(6)
Net other comprehensive income/(loss) before tax	17	(8)	(32)
Corresponding income tax	(4)	(2)	9
Net other comprehensive income/(loss) after tax	13	(10)	(23)
Ending Balance	(78)	(91)	(81)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,853)	(3,159)	(1,955)
Cumulative effect of new accounting standard (See Note 1)	5
Other comprehensive income/(loss) before reclassifications	(649)	969	(1,328)
Amounts reclassified to the statements of income	42	334	151
Net other comprehensive income/(loss) before tax	(607)	1,303	(1,177)
Corresponding income tax	(4)	3	(27)
Net other comprehensive income/(loss) after tax	(611)	1,306	(1,204)
Ending Balance	$ (2,459)	$ (1,853)	$ (3,159)

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Reclassification From Accumulated Other Comprehensive Income To Retained Earning

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