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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses), net of tax $ 10 $ 13 $ 6 $ 2
Net change related to other comprehensive income (loss), tax (1) (9) 5 (8)
Investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses), net of tax 352 89 277 (421)
Net change related to other comprehensive income (loss), tax 353 91 284 (412)
Translation adjustments and other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net change related to other comprehensive income (loss), tax $ 0 $ 0 $ 0 $ 0