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Worldwide Pandemic - Voluntary Separation Program 2020 and Extended ETO (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Voluntary Separation Program 2020 Accrual for Employees who Accepted through June 30, 2020   $ 307
Voluntary Separation Program 2020 Total Accrued $ 619 307
Extended Emergency Time Off Accrual for Employees who Accepted through June 30, 2020   0
Extended Emergency Time Off Accrual for Employees who Accepted through September 30, 2020 613  
Extended Emergency Time Off Reduction for Employees who Accepted through September 30, 2020 (25)  
Emergency Extended Time Off Total Accrued 588 0
Voluntary Separation Program 2020 and Extended Emergency Time Off Accrual for Employees who Accepted through June 30, 2020   307
Voluntary Separation Program 2020 and Extended Emergency Time Off Reduction for Employees who Accepted through September 30, 2020 (198)  
Voluntary Separation Program 2020 and Extended Emergency Time Off Total Accrued 1,207 $ 307
Voluntary Separation Program 2020 Accrual for Employees who Accepted after June 30, 2020 485  
Voluntary Separation Program 2020 Reduction for Employees who Accepted after June 30, 2020 $ (173)