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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period     $ 206,223  
Other comprehensive income (loss) $ 1,988 $ 886 1,394 $ (1,779)
Balance, end of period 238,268 183,136 238,268 183,136
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (6) (6) (27) (13)
Unrealized gains (losses), net of tax 37 49 22 9
Tax expense (benefit) included in provision for income taxes 11 22 1 10
Amounts reclassified from accumulated other comprehensive loss (40) (81) (4) (34)
Other comprehensive income (loss) (3) (32) 18 (25)
Balance, end of period (9) (38) (9) (38)
Derivatives | Other Income (Expense), Net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses included in other income (expense), net (51) (103) (5) (44)
Investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (3,842) (4,035) (3,582) (2,138)
Unrealized gains (losses), net of tax 1,325 340 1,042 (1,585)
Tax expense (benefit) included in provision for income taxes (1) (2) (7) (9)
Amounts reclassified from accumulated other comprehensive loss 6 8 29 36
Other comprehensive income (loss) 1,331 348 1,071 (1,549)
Balance, end of period (2,511) (3,687) (2,511) (3,687)
Investments | Other Income (Expense), Net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses included in other income (expense), net 7 10 36 45
Translation adjustments and other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (3,089) (3,302) (2,734) (2,527)
Other comprehensive income (loss) 660 570 305 (205)
Balance, end of period (2,429) (2,732) (2,429) (2,732)
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (6,937) (7,343) (6,343) (4,678)
Other comprehensive income (loss) 1,988 886 1,394 (1,779)
Balance, end of period $ (4,949) $ (6,457) $ (4,949) $ (6,457)