Equity and Accumulated Other Comprehensive Loss - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	$ 92,463
Ending balance	94,219	$ 85,175
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(1,865)	(927)
Other comprehensive income	30
Amounts reclassified to net income	(60)
Other comprehensive income (loss)	(312)	21
Ending balance	(2,177)	$ (906)
Foreign  currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(698)
Other comprehensive income	26
Other comprehensive income (loss)	26
Ending balance	(672)
Unrealized gain (loss) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(1,150)
Other comprehensive income	0
Amounts reclassified to net income	21
Other comprehensive income (loss)	21
Ending balance	(1,129)
Unrealized loss on fair value hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(431)
Other comprehensive income	(282)
Amounts reclassified to net income	(20)
Other comprehensive income (loss)	(302)
Ending balance	(733)
Unrealized gain (loss) on marketable securities
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(9)
Other comprehensive income	4
Other comprehensive income (loss)	4
Ending balance	(5)
Defined benefit pension and postretirement plans
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	423
Other comprehensive income	0
Amounts reclassified to net income	(61)
Other comprehensive income (loss)	(61)
Ending balance	$ 362