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Restructuring and Impairment Charges	6 Months Ended
Restructuring and Impairment Charges	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure	Restructuring and Impairment Charges and Other Income The Company recorded $13 million and $28 million of restructuring and impairment charges in the current quarter and six-month period, respectively, primarily for severance costs. The Company recorded $94 million of other income in the six-month period, which included a $53 million gain from the sale of property rights in the first quarter and $41 million, primarily for insurance proceeds related to a legal matter, in the current quarter.