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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Statement of AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 52,284 $ 50,559 $ 47,065
Other comprehensive income/(loss), before tax:      
OCI before reclassifications (437) (1,769)  
Amounts reclassified to the Consolidated Statement of Earnings 143 671  
Total other comprehensive income/(loss), before tax (294) (1,098)  
Tax effect (49) 850  
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX (343) (248) 317
Less: OCI attributable to non-controlling interests, net of tax (21) (4)  
Ending balance 54,311 52,284 50,559
Total AOCI      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (12,143) (11,900)  
Other comprehensive income/(loss), before tax:      
Ending balance (12,465) (12,143) (11,900)
Investment Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 9 10  
Other comprehensive income/(loss), before tax:      
OCI before reclassifications 2 (1)  
Amounts reclassified to the Consolidated Statement of Earnings 0 0  
Total other comprehensive income/(loss), before tax 2 (1)  
Tax effect (1) 1  
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX 1 0  
Less: OCI attributable to non-controlling interests, net of tax 0 0  
Ending balance 10 9 10
Post-retirement Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (777) 613  
Other comprehensive income/(loss), before tax:      
OCI before reclassifications (533) (1,717)  
Amounts reclassified to the Consolidated Statement of Earnings 12 (81)  
Total other comprehensive income/(loss), before tax (521) (1,798)  
Tax effect 81 407  
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX (440) (1,390)  
Less: OCI attributable to non-controlling interests, net of tax (1) 0  
Ending balance (1,216) (777) 613
Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (11,375) (12,522)  
Other comprehensive income/(loss), before tax:      
OCI before reclassifications 94 (51)  
Amounts reclassified to the Consolidated Statement of Earnings 131 752  
Total other comprehensive income/(loss), before tax 226 701  
Tax effect (129) 442  
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAX 96 1,143  
Less: OCI attributable to non-controlling interests, net of tax (20) (4)  
Ending balance $ (11,259) $ (11,375) $ (12,522)