Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ 268,477
Other comprehensive income (loss)	$ (1,434)	$ 1,988	(26)	$ 1,394
Balance, end of period	302,695	238,268	302,695	238,268
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(13)	(6)	(3)	(27)
Unrealized gains (losses), net of tax	(50)	37	(21)	22
Tax expense (benefit) included in provision for income taxes	(22)	11	(12)	1
Amounts reclassified from accumulated other comprehensive loss	84	(40)	45	(4)
Other comprehensive income (loss)	34	(3)	24	18
Balance, end of period	21	(9)	21	(9)
Derivatives | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses included in other income (expense), net	106	(51)	57	(5)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,511)	(3,842)	(2,625)	(3,582)
Unrealized gains (losses), net of tax	(453)	1,325	665	1,042
Tax expense (benefit) included in provision for income taxes	(5)	(1)	(4)	(7)
Amounts reclassified from accumulated other comprehensive loss	19	6	15	29
Other comprehensive income (loss)	(434)	1,331	680	1,071
Balance, end of period	(1,945)	(2,511)	(1,945)	(2,511)
Investments | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses included in other income (expense), net	24	7	19	36
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2,658)	(3,089)	(2,962)	(2,734)
Other comprehensive income (loss)	(1,034)	660	(730)	305
Balance, end of period	(3,692)	(2,429)	(3,692)	(2,429)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(4,182)	(6,937)	(5,590)	(6,343)
Other comprehensive income (loss)	(1,434)	1,988	26	1,394
Balance, end of period	$ (5,616)	$ (4,949)	$ (5,616)	$ (4,949)