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Income Taxes (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 15 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Income Tax [Line Items]          
Income taxes $ 51 $ 155 $ 310 $ 429  
Effective income tax rate 11.00% 20.00% 20.00% 21.00%  
Tax benefit from provisional updates and research and development multiyear tax credit study $ 57        
Tax benefit from provisional updates and research and development multiyear tax study per share $ 0.10        
Favorable discrete items, percentage impact 12.00% 3.00% 3.00% 3.00%  
Tax benefit from restructuring foreign subsidiary   $ 21      
Tax benefit from restructuring foreign subsidiary per share   $ 0.03      
Forecast [Member]          
Income Tax [Line Items]          
Payroll tax deferral from CARES Act expected through December 2020         $ 75