Accumulated Other Comprehensive Income/(Loss) - Statement of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 51,443	$ 48,829	$ 50,559	$ 47,065
Other comprehensive income/(loss), before tax:
OCI before reclassifications			(192)
Amounts reclassified to the Consolidated Statement of Earnings			690
Total other comprehensive income/(loss), before tax			498
Tax effect			92
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	330	(204)	590	(153)
Less: OCI attributable to noncontrolling interests, net of tax			(2)
Ending balance	52,545	50,333	52,545	50,333
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(11,637)	(12,167)	(11,900)	(12,220)
Other comprehensive income/(loss), before tax:
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	330	(203)	592	(150)
Ending balance	(11,307)	$ (12,370)	(11,307)	$ (12,370)
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			3
Amounts reclassified to the Consolidated Statement of Earnings			0
Total other comprehensive income/(loss), before tax			3
Tax effect			0
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX			3
Less: OCI attributable to noncontrolling interests, net of tax			0
Ending balance	13		13
Postretirement 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			13
Amounts reclassified to the Consolidated Statement of Earnings			(62)
Total other comprehensive income/(loss), before tax			(49)
Tax effect			13
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX			(37)
Less: OCI attributable to noncontrolling interests, net of tax			2
Ending balance	574		574
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			(208)
Amounts reclassified to the Consolidated Statement of Earnings			752
Total other comprehensive income/(loss), before tax			544
Tax effect			79
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX			623
Less: OCI attributable to noncontrolling interests, net of tax			(4)
Ending balance	$ (11,894)		$ (11,894)