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Debt (Tables)
6 Months Ended
Mar. 31, 2018
Debt Instruments [Abstract]  
Schedule of Major Components Of Debt
The major components of debt are as follows (in millions):
 
March 31, 2018
 
September 30, 2017
Revolving credit facility
$

 
$

Commercial paper
1,000

 
778

Senior notes:
 
 
 
7.00% Notes due May 2018
120

 
120

Notes due May 2019 (2.43% at 3/31/2018)
300

 
300

2.65% Notes due August 2019
1,000

 
1,000

Notes due June 2020 (2.57% at 3/31/2018)
350

 
350

Notes due August 2020 (2.34% at 3/31/2018)
400

 
400

4.10% Notes due September 2020
282

 
282

2.25% Notes due August 2021
500

 
500

4.50% Senior notes due June 2022
1,000

 
1,000

3.95% Notes due August 2024
1,250

 
1,250

3.55% Notes due June 2027
1,350

 
1,350

7.00% Notes due January 2028
18

 
18

6.13% Notes due November 2032
162

 
162

4.88% Notes due August 2034
500

 
500

5.15% Notes due August 2044
500

 
500

4.55% Notes due June 2047
750

 
750

Discount on senior notes
(14
)
 
(15
)
Term loans:
 
 
 
Tranche B due August 2019

 
427

Tranche B due August 2020 (2.74% at 3/31/2018)
500

 
500

Other
77

 
81

Unamortized debt issuance costs
(45
)
 
(50
)
Total debt
10,000

 
10,203

Less current debt
1,128

 
906

Total long-term debt
$
8,872

 
$
9,297