Equity and Accumulated Other Comprehensive Loss - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance			$ 92,463
Ending balance	$ 96,502	$ 87,357	96,502	$ 87,357
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(2,177)	(906)	(1,865)	(927)
Other comprehensive income			25
Amounts reclassified to net income			(112)
Other comprehensive income (loss)	256	(414)	(56)	(393)
Ending balance	(1,921)	$ (1,320)	(1,921)	$ (1,320)
Foreign  currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance			(698)
Other comprehensive income			20
Other comprehensive income (loss)			20
Ending balance	(678)		(678)
Unrealized gain (loss) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance			(1,150)
Other comprehensive income			4
Amounts reclassified to net income			42
Other comprehensive income (loss)			46
Ending balance	(1,104)		(1,104)
Unrealized gain (loss) on fair value hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance			(431)
Other comprehensive income			31
Amounts reclassified to net income			(40)
Other comprehensive income (loss)			(9)
Ending balance	(440)		(440)
Unrealized gain (loss) on marketable securities
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance			(9)
Other comprehensive income			1
Amounts reclassified to net income			1
Other comprehensive income (loss)			2
Ending balance	(7)		(7)
Defined benefit pension and postretirement plans
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance			423
Amounts reclassified to net income			(115)
Other comprehensive income (loss)			(115)
Ending balance	$ 308		$ 308