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Debt
 3 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Debt
Note 7—Debt
The Company had outstanding debt as follows:
 
December 31, 2019
 
September 30, 2019
 
Effective Interest Rate(1)
 
(in millions, except percentages)
2.20% Senior Notes due December 2020
$
3,000

 
$
3,000

 
2.30
%
2.15% Senior Notes due September 2022
1,000

 
1,000

 
2.30
%
2.80% Senior Notes due December 2022
2,250

 
2,250

 
2.89
%
3.15% Senior Notes due December 2025
4,000

 
4,000

 
3.26
%
2.75% Senior Notes due September 2027
750

 
750

 
2.91
%
4.15% Senior Notes due December 2035
1,500

 
1,500

 
4.23
%
4.30% Senior Notes due December 2045
3,500

 
3,500

 
4.37
%
3.65% Senior Notes due September 2047
750

 
750

 
3.73
%
Total senior notes
16,750

 
16,750

 
 
Unamortized discounts and debt issuance costs
(105
)
 
(108
)
 
 
Hedge accounting fair value adjustments(2)
43

 
87

 
 
Less: current maturities of long-term debt
(3,000
)
 
—

 
 
Total long-term debt
$
13,688

 
$
16,729

 
 

(1) 
Effective interest rates disclosed do not reflect hedge accounting adjustments.
(2) 
Represents the change in fair value of interest rate swap agreements entered into on a portion of the outstanding Senior Notes.