DEBT

Our total debt consists of the following:



Debt (in millions)	December 31, 2018		September 30, 2018
Senior Notes and Debentures:
Senior notes due September 2019, 5.625%	$	221	$	550
Senior notes due December 2019, 2.750%	90		252
Senior notes due March 2021, 4.500%	498		497
Senior notes due December 2021, 3.875%	596		596
Senior notes due February 2022, 2.250%	49		102
Senior notes due June 2022, 3.125%	194		194
Senior notes due March 2023, 3.250%	181		181
Senior notes due September 2023, 4.250%	1,240		1,239
Senior notes due April 2024, 3.875%	489		488
Senior notes due October 2026, 3.450%	123		474
Senior debentures due December 2034, 4.850%	86		281
Senior debentures due April 2036, 6.875%	1,068		1,068
Senior debentures due October 2037, 6.750%	75		75
Senior debentures due February 2042, 4.500%	45		62
Senior debentures due March 2043, 4.375%	1,103		1,102
Senior debentures due June 2043, 4.875%	18		32
Senior debentures due September 2043, 5.850%	1,230		1,230
Senior debentures due April 2044, 5.250%	345		345
Junior Debentures:
Junior subordinated debentures due February 2057, 5.875%	642		642
Junior subordinated debentures due February 2057, 6.250%	642		642
Capital lease and other obligations	26		30
Total debt	8,961		10,082
Less current portion	326		567
Noncurrent portion	$	8,635	$	9,515

In the quarter ended December 31, 2018, we redeemed $1.128 billion of senior notes and debentures for a redemption price of $1.100 billion. As a result, we recognized a pre-tax extinguishment gain of $18 million, net of $10 million of unamortized debt costs and transaction fees.

Our 5.875% Junior subordinated debentures due February 2057 and 6.250% Junior subordinated debentures due February 2057 accrue interest at the stated fixed rates until February 28, 2022 and February 28, 2027, respectively, on which dates the rates will switch to floating rates based on three-month LIBOR plus 3.895% and 3.899%, respectively, reset quarterly. These debentures can be called by us at any time after the expiration of the fixed-rate period.

The total unamortized discount and issuance fees and expenses related to our notes and debentures outstanding was $419 million and $431 million as of December 31, 2018 and September 30, 2018, respectively.

Credit Facility

As of December 31, 2018, there were no amounts outstanding under our $2.5 billion revolving credit facility due November 2019. The credit facility is used for general corporate purposes and to support commercial paper outstanding. The credit facility has one principal financial covenant that requires our interest coverage for the most recent four consecutive fiscal quarters to be at least 3.0x, which we met as of December 31, 2018.