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Financial Instruments and Fair Value Measurement - Cash and Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Fair Value Disclosures [Abstract]        
Cash and equivalents $ 536 $ 1,140    
Restricted Cash and Investments, Current 54 96    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 590 $ 1,236 $ 14,179 $ 1,541