Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 22,271	$ 19,476	$ 22,021	$ 18,996
Balance at the end of the period	23,156	20,147	23,156	20,147
Pension settlement charge		5,900	0	5,894	[1]
Pension settlement charge, net of tax		4,400
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(16,499)	(22,169)	(16,740)	(23,234)
Other comprehensive income before reclassifications			326	697
Amount reclassified from accumulated other comprehensive income			316	5,399
Other comprehensive income/(loss)	402	5,030	642	6,096
Balance at the end of the period	(16,098)	(17,138)	(16,098)	(17,138)
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			(135)	(18)
Other comprehensive income before reclassifications	95	140	203	332
Amount reclassified from accumulated other comprehensive income			40	6
Other comprehensive income/(loss)	248	133	243	338
Balance at the end of the period	109	320	109	320
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			(3,591)	(3,362)
Other comprehensive income before reclassifications			39	14
Other comprehensive income/(loss)	(13)	(158)	39	14
Balance at the end of the period	(3,552)	(3,347)	(3,552)	(3,347)
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			(13,013)	(19,854)
Other comprehensive income before reclassifications			86	352
Amount reclassified from accumulated other comprehensive income			276	5,393
Other comprehensive income/(loss)	167	5,056	361	5,745
Balance at the end of the period	(12,652)	(14,110)	(12,652)	(14,110)
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	$ (2)	$ (1)	$ (2)	$ (1)

[1] ncludes immaterial cash flows from discontinued operations.