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Share-Based Compensation (Additional Data Related to Performance Share Unit Activity) (Details) - Performance Share Units $ in Millions | 12 Months Ended
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Jun. 30, 2021 USD ($) vestingPeriods | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost, net of estimated forfeitures, related to nonvested performance share units not yet recognized, pre-tax | $ 26 | $ 29 | $ 12
Weighted-average period over which performance share unit cost is expected to be recognized (in years) | 2 years | 2 years | 2 years
Total fair value of shares vested during the year | $ 1 | $ 5 | $ 0
Vesting Period in years for Shares | vestingPeriods | 3 |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Target performance goal (as a percent) | 0.00% |  |

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