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Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax benefit $ (73) $ (27) $ (86) $ (48)
INCOME FROM CONTINUING OPERATIONS 241 75 282 167
Amount Reclassified from Accumulated Other Comprehensive Income | Employee Benefit Related Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Prior service benefit (9) (8) (18) (17)
Actuarial losses 11 9 23 19
Total before tax 2 1 5 2
Tax benefit 0 0 0 0
INCOME FROM CONTINUING OPERATIONS $ 2 $ 1 $ 5 $ 2