Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 24,103	$ 22,271	$ 22,613	$ 22,021
Balance at the end of the period	24,530	23,156	24,530	23,156
Pension settlement charge	2,700		2,725	0
Pension settlement charge, net of tax	2,000
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(18,319)	(16,499)	(18,761)	(16,740)
Other comprehensive income before reclassifications			(100)	326
Amount reclassified from accumulated other comprehensive income			2,443	316
Other comprehensive income/(loss)	1,900	402	2,343	642
Balance at the end of the period	(16,418)	(16,098)	(16,418)	(16,098)
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	(158)	95	46	203
Amount reclassified from accumulated other comprehensive income			(151)	40
Other comprehensive income/(loss)	(333)	248	(105)	243
Balance at the end of the period	(211)	109	(211)	109
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			(224)	39
Other comprehensive income/(loss)	(60)	(13)	(224)	39
Balance at the end of the period	(3,713)	(3,552)	(3,713)	(3,552)
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			78	86
Amount reclassified from accumulated other comprehensive income			2,594	276
Other comprehensive income/(loss)	2,293	167	2,672	361
Balance at the end of the period	(12,493)	(12,652)	(12,493)	(12,652)
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	0	1	(1)
Other comprehensive income/(loss)	0	0	1	(1)
Balance at the end of the period	$ (1)	$ (2)	$ (1)	$ (2)