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Income Tax Expense - Unrecognized Tax Benefits (Details)
$ in Millions
9 Months Ended
Mar. 31, 2023
USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]  
Unrecognized tax benefit, beginning balance $ 1,047
Gross increases related to current year tax positions 6
Gross increases related to prior year tax positions 3
Gross decreases related to prior year tax positions (25)
Settlements (5)
Lapse of statute of limitations (3)
Unrecognized tax benefit, ending balance $ 1,023