Equity and Comprehensive Income (Loss) - Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	$ 83,200	$ 69,272
Balance at end of year	92,463	83,200	$ 69,272
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(927)	(71)	998
Other comprehensive income (loss)	(669)	(1,467)	1,140
Amounts reclassified to net income	102	611	(2,209)
Net other comprehensive income (loss)	(938)	(856)	(1,069)
Balance at end of year	(1,865)	(927)	(71)
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(545)	(404)	(584)
Other comprehensive income (loss)	(153)	(141)	180
Amounts reclassified to net income	0	0	0
Net other comprehensive income (loss)	(153)	(141)	180
Balance at end of year	(698)	(545)	(404)
Unrealized gain (loss) on cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(1,472)	(1,387)	(816)
Other comprehensive income (loss)	(174)	(1,318)	953
Amounts reclassified to net income	496	1,233	(1,524)
Net other comprehensive income (loss)	322	(85)	(571)
Balance at end of year	(1,150)	(1,472)	(1,387)
Unrealized loss on fair value hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	0	0	0
Other comprehensive income (loss)	(371)
Amounts reclassified to net income	(60)
Net other comprehensive income (loss)	(431)
Balance at end of year	(431)	0	0
Unrealized gain (loss) on marketable securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	16	25	27
Other comprehensive income (loss)	(25)	(8)	7
Amounts reclassified to net income	0	(1)	(9)
Net other comprehensive income (loss)	(25)	(9)	(2)
Balance at end of year	(9)	16	25
Defined benefit pension and postretirement plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	1,074	1,695	2,371
Other comprehensive income (loss)	(317)	0	0
Amounts reclassified to net income	(334)	(621)	(676)
Net other comprehensive income (loss)	(651)	(621)	(676)
Balance at end of year	$ 423	$ 1,074	$ 1,695