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Comprehensive Income (Loss) (Tables)
6 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss The following summary sets forth the changes in the components of accumulated other comprehensive loss, net of related tax expense of approximately $2 million:
Foreign Currency Translation Loss (a)Minimum Pension Liability AdjustmentDeferred Gains (Losses) On Derivative Financial InstrumentsAccumulated Other Comprehensive Loss, net
 
(in millions)
Balances at September 30, 2020$(181)$(12)$(29)$(222)
Other comprehensive income— 13 
Balances at March 31, 2021$(174)$(12)$(23)$(209)
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(a)Includes historical foreign currency translation related to certain intra-entity transactions.