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Income Taxes Significant Components of Company's Income Tax Provision from Continuing Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Components of Income Tax [Line Items]        
Tax expense at federal statutory rate   $ 363 $ 320 $ 371
State income taxes, net of federal benefit   24 23 (6)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount       (122)
Income Tax Reconciliation, Foreign Income Tax Rate Differential, US   16 (188)  
Income Tax Reconciliation Foreign Income Tax Rate Differential, Non-US   (164) 256  
U.S. tax on foreign income       (194)
U.S. credits and incentives       (14)
Impact of acquisitions and divestitures   145 475 163
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   108 0  
Restructuring and impairment costs   (5) (17) 28
Other $ 53 31 (164) (29)
Income tax provision   $ 518 $ 705 $ 197
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     12.50%  
IRELAND        
Components of Income Tax [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   12.50% 12.50%