Equity and Accumulated Other Comprehensive Loss - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 100,575
Ending balance	$ 104,361	$ 97,539	104,361	$ 97,539
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,489)	(1,199)	(923)	(1,380)
Other comprehensive income (loss)			103
Amounts reclassified to net income			2
Other comprehensive income (loss)	14	(88)	(552)	93
Ending balance	(1,475)	$ (1,287)	(1,475)	$ (1,287)
Foreign  currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(733)
Other comprehensive income (loss)			143
Other comprehensive income (loss)			143
Ending balance	(590)		(590)
Unrealized gain (loss) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(981)
Other comprehensive income (loss)			(41)
Amounts reclassified to net income			41
Other comprehensive income (loss)			0
Ending balance	(981)		(981)
Unrealized gain (loss) on fair value hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			589
Other comprehensive income (loss)			(657)
Amounts reclassified to net income			(35)
Other comprehensive income (loss)			(692)
Ending balance	(103)		(103)
Unrealized gain (loss) on marketable securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(5)
Other comprehensive income (loss)			1
Other comprehensive income (loss)			1
Ending balance	(4)		(4)
Defined benefit pension and postretirement plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			207
Amounts reclassified to net income			(4)
Other comprehensive income (loss)			(4)
Ending balance	$ 203		$ 203