Accumulated Other Comprehensive Income/(Loss) - Statement of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 52,141	$ 48,014	$ 50,559	$ 47,065
Other comprehensive income/(loss), before tax:
OCI before reclassifications			(323)
Amounts reclassified to the Consolidated Statement of Earnings			714
Total other comprehensive income/(loss), before tax			391
Tax effect			(131)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	(747)	416	260	51
Less: OCI attributable to noncontrolling interests, net of tax			(3)
Ending balance	51,443	48,829	51,443	48,829
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(10,893)	(12,583)	(11,900)	(12,220)
Other comprehensive income/(loss), before tax:
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX	(744)	416	263	53
Ending balance	(11,637)	$ (12,167)	(11,637)	$ (12,167)
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			1
Amounts reclassified to the Consolidated Statement of Earnings			0
Total other comprehensive income/(loss), before tax			1
Tax effect			0
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX			1
Less: OCI attributable to noncontrolling interests, net of tax			0
Ending balance	11		11
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			38
Amounts reclassified to the Consolidated Statement of Earnings			(38)
Total other comprehensive income/(loss), before tax			0
Tax effect			3
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX			3
Less: OCI attributable to noncontrolling interests, net of tax			2
Ending balance	614		614
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			(362)
Amounts reclassified to the Consolidated Statement of Earnings			752
Total other comprehensive income/(loss), before tax			390
Tax effect			(134)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX			256
Less: OCI attributable to noncontrolling interests, net of tax			(5)
Ending balance	$ (12,262)		$ (12,262)