NOTE G. Long-term Debt and Interest Expense

Long-term debt, including the effects of issuance discounts and net deferred fair value hedge losses, consisted of the following components at December 31, 2014 and 2013:



	December 31,
	2014			2013
	(in millions)
Outstanding debt principal balances:
5.875% senior notes due 2016	$	455		$	455
6.65% senior notes due 2017	485			485
6.875 % senior notes due 2018	450			450
7.500 % senior notes due 2020	450			450
3.95% senior notes due 2022	600			600
7.20% senior notes due 2028	250			250
	2,690			2,690
Issuance discounts	(24		)	(36		)
Net deferred fair value hedge losses	(1		)	(1		)
Total long-term debt	$	2,665		$	2,653

Credit facility. The Company maintains a revolving credit agreement (the "Credit Facility") with a syndicate of financial institutions with aggregate loan commitments of $1.5 billion that expire in December 2017. As of December 31, 2014, the Company had no outstanding borrowings under the Credit Facility.

Borrowings under the Credit Facility may be in the form of revolving loans or swing line loans. Aggregate outstanding swing line loans may not exceed $150 million. Revolving loans under the Credit Facility bear interest, at the option of the Company, based on (a) a rate per annum equal to the higher of the prime rate announced from time to time by Wells Fargo Bank, National Association or the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System during the last preceding business day plus 0.5 percent plus a defined alternate base rate spread margin, which is currently 0.5 percent based on the Company's debt rating or (b) a base Eurodollar rate, substantially equal to LIBOR, plus a margin (the "Applicable Margin"), which is currently 1.50 percent and is also determined by the Company's debt rating. Swing line loans under the Credit Facility bear interest at a rate per annum equal to the "ASK" rate for Federal funds periodically published by the Dow Jones Market Service plus the Applicable Margin. Letters of credit outstanding under the Credit Facility are subject to a per annum fee, representing the Applicable Margin plus 0.125 percent. The Company also pays commitment fees on undrawn amounts under the Credit Facility that are determined by the Company's debt rating (currently 0.25 percent). Borrowings under the Credit Facility are general unsecured obligations.

The Credit Facility requires the maintenance of a ratio of total debt to book capitalization, subject to certain adjustments, not to exceed .60 to 1.0. As of December 31, 2014, the Company was in compliance with all of its debt covenants.

Senior notes. The Company's senior notes are general unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company and are senior in right of payment to all existing and future subordinated indebtedness of the Company. The Company is a holding company that conducts all of its operations through subsidiaries; consequently, the senior notes are structurally subordinated to all obligations of its subsidiaries. Interest on the Company's senior notes is payable semiannually.

Convertible senior notes. As of December 31, 2012, the Company had $480 million of Convertible Senior Notes outstanding. During December 2012 and March 2013, the Company's stock price met the price threshold that caused the Convertible Senior Notes to be convertible during the six months ended June 30, 2013 at the option of the holders into a combination of cash and the Company's common stock based on a formula set forth in the indenture supplement pursuant to which the Convertible Senior Notes were issued. On April 15, 2013, the Company announced that it would exercise its option to redeem all Convertible Senior Notes that had not been converted by the holders before May 16, 2013. Associated therewith, during the six months ended June 30, 2013, holders of $479 million principal amount of the Convertible Senior Notes exercised their right to convert their Convertible Senior Notes into cash and shares of the Company's common stock. The Company paid the tendering holders $479 million of cash and issued to the tendering holders 4.4 million shares of the Company's common stock in accordance with the terms of the Convertible Senior Notes indenture agreement. On May 16, 2013, the Company paid $1 million in principal and interest to redeem all Convertible Senior Notes that remained outstanding.

For the years ended December 31, 2013 and 2012, the Company recorded $9.4 million and $33.5 million, respectively, of interest expense relating to the Convertible Senior Notes, which had an effective interest rate of 6.75 percent.

Principal maturities. Principal maturities of long-term debt at December 31, 2014, are as follows (in millions):



2015	$	—
2016	$	455
2017	$	485
2018	$	450
2019	$	—
Thereafter	$	1,300

Interest expense. The following amounts have been incurred and charged to interest expense for the years ended December 31, 2014, 2013 and 2012:



	Year Ended December 31,
	2014			2013			2012
	(in millions)
Cash payments for interest	$	193		$	183		$	168
Amortization of issuance discounts	12			12			28
Amortization of net deferred hedge losses (a)	—			—			2
Amortization of capitalized loan fees	5			5			6
Net changes in accruals	(22		)	(6		)	11
Interest incurred	188			194			215
Less capitalized interest	(4		)	(10		)	(11		)
Total interest expense	$	184		$	184		$	204

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(a)	Includes interest rate derivative hedges of $2 million for the period ended December 31, 2012 that were reclassified from AOCI - Hedging into earnings upon expiration (see Note E).