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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Assets:          
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ 0 $ 0 $ 0 $ 0  
Recurring          
Assets:          
Cash equivalents 1,920   1,920   $ 721
Other investments 120   120   114
Forward contracts 5   5   53
Recurring | Level 1          
Assets:          
Cash equivalents 1,920   1,920   721
Other investments 120   120   114
Forward contracts 0   0   0
Recurring | Level 2          
Assets:          
Cash equivalents 0   0   0
Other investments 0   0   0
Forward contracts 5   5   53
Recurring | Level 3          
Assets:          
Cash equivalents 0   0   0
Other investments 0   0   0
Forward contracts $ 0   $ 0   $ 0