Accumulated Other Comprehensive Income/(Loss) - Statement of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 50,559	$ 47,065
Other comprehensive income/(loss), before tax:
OCI before reclassifications	(1)
Amounts reclassified to the Consolidated Statement of Earnings	738
Total other comprehensive income/(loss), before tax	737
Tax effect	269
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	1,007	(366)
Less: OCI attributable to noncontrolling interests, net of tax	1
Ending balance	52,141	48,014
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(11,900)	(12,220)
Other comprehensive income/(loss), before tax:
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	1,006	(363)
Ending balance	(10,893)	$ (12,583)
Investment Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	10
Other comprehensive income/(loss), before tax:
OCI before reclassifications	2
Amounts reclassified to the Consolidated Statement of Earnings	0
Total other comprehensive income/(loss), before tax	2
Tax effect	0
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	2
Less: OCI attributable to noncontrolling interests, net of tax	0
Ending balance	12
Post-retirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	613
Other comprehensive income/(loss), before tax:
OCI before reclassifications	(15)
Amounts reclassified to the Consolidated Statement of Earnings	(14)
Total other comprehensive income/(loss), before tax	(29)
Tax effect	8
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	(21)
Less: OCI attributable to noncontrolling interests, net of tax	1
Ending balance	591
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(12,522)
Other comprehensive income/(loss), before tax:
OCI before reclassifications	13
Amounts reclassified to the Consolidated Statement of Earnings	752
Total other comprehensive income/(loss), before tax	765
Tax effect	261
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	1,026
Less: OCI attributable to noncontrolling interests, net of tax	0
Ending balance	$ (11,496)