Accumulated Other Comprehensive Income/(Loss) - Statement of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 52,284	$ 50,559
Other comprehensive income/(loss), before tax:
OCI before reclassifications	(19)
Amounts reclassified to the Consolidated Statement of Earnings	13
Total other comprehensive income/(loss), before tax	(7)
Tax effect	(12)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	(19)	1,007
Less: OCI attributable to noncontrolling interests, net of tax	(6)
Ending balance	53,551	$ 52,141
Total AOCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(12,143)
Other comprehensive income/(loss), before tax:
Ending balance	(12,156)
Investment Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	9
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	7
Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(777)
Other comprehensive income/(loss), before tax:
OCI before reclassifications	(8)
Amounts reclassified to the Consolidated Statement of Earnings	13
Total other comprehensive income/(loss), before tax	5
Tax effect	(2)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	3
Less: OCI attributable to noncontrolling interests, net of tax	0
Ending balance	(774)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(11,375)
Other comprehensive income/(loss), before tax:
OCI before reclassifications	(10)
Amounts reclassified to the Consolidated Statement of Earnings	0
Total other comprehensive income/(loss), before tax	(10)
Tax effect	(10)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	(20)
Less: OCI attributable to noncontrolling interests, net of tax	(6)
Ending balance	$ (11,389)