Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 22,613	$ 22,021
Balance at the end of the period	23,333	21,672
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(18,761)	(16,740)
Other comprehensive income before reclassifications	30	(39)
Amount reclassified from accumulated other comprehensive income	243	0
Other comprehensive income/(loss)	273	(40)
Balance at the end of the period	(18,488)	(16,780)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(106)	(135)
Other comprehensive income before reclassifications	129	(23)
Amount reclassified from accumulated other comprehensive income	54	(90)
Other comprehensive income/(loss)	183	(113)
Balance at the end of the period	76	(248)
Accumulated Foreign Currency Adjustment Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(3,488)	(3,591)
Other comprehensive income before reclassifications	(99)	(30)
Other comprehensive income/(loss)	(99)	(30)
Balance at the end of the period	(3,588)	(3,621)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(15,165)	(13,013)
Other comprehensive income before reclassifications	0	2
Amount reclassified from accumulated other comprehensive income	189	90
Other comprehensive income/(loss)	189	92
Balance at the end of the period	(14,976)	(12,921)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(1)	(1)
Other comprehensive income before reclassifications	0	11
Other comprehensive income/(loss)	0	11
Balance at the end of the period	$ (1)	$ 10