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Divestiture (Details)
$ in Millions, $ in Millions
3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2020
USD ($)
Jul. 31, 2020
AUD ($)
Sep. 30, 2020
USD ($)
Jul. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Divestiture          
Gain on sale of ANZ businesses     $ 280   $ 280
Australia And New Zealand ("ANZ") business | Discontinued Operations, Disposed of by Sale          
Divestiture          
Gross proceeds $ 677 $ 947      
Sale and related sale lease-back net proceeds   $ 214      
Percentage of proceeds were received at time of closing 95.00% 95.00%      
Time in which the remaining balance to be received 12 months 12 months      
Pretax income       $ 6  
Australia And New Zealand ("ANZ") business | Other operating income (expense) | Discontinued Operations, Disposed of by Sale          
Divestiture          
Gain on sale of ANZ businesses $ 280