Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 27,393	$ 22,613
Balance at the end of the period	26,953	23,333
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(15,269)	(18,761)
Other comprehensive income before reclassifications	(176)	30
Amount reclassified from accumulated other comprehensive income	(130)	243
Other comprehensive income/(loss)	(306)	273
Balance at the end of the period	(15,575)	(18,488)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(3,512)	(3,488)
Other comprehensive income before reclassifications	(139)	(99)
Other comprehensive income/(loss)	(139)	(99)
Balance at the end of the period	(3,651)	(3,588)
Net Unrealized Gains/(Losses) on Available- For-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	0	(1)
Other comprehensive income before reclassifications	6	0
Other comprehensive income/(loss)	6	0
Balance at the end of the period	6	(1)
Net Unrealized Gains/(Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	237	(106)
Other comprehensive income before reclassifications	(42)	129
Amount reclassified from accumulated other comprehensive income	(241)	54
Other comprehensive income/(loss)	(283)	183
Balance at the end of the period	(46)	76
Net Change Retirement- Related Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(11,994)	(15,165)
Other comprehensive income before reclassifications	0	0
Amount reclassified from accumulated other comprehensive income	111	189
Other comprehensive income/(loss)	111	189
Balance at the end of the period	$ (11,884)	$ (14,976)